docs: add printing-workflow roadmap candidates

Outline features, defects, UI tweaks, and backend work that can
follow the shipped printer path. Display profiling and issue #16
stay out of scope.

AGENTS.md

@@ -93,6 +93,57 @@ codesign -dvv <sidecar>
 ```
 Universal (`ARCHS='arm64 x86_64' ONLY_ACTIVE_ARCH=NO`) is still required for release verification / packaging.
 
+## Remote test builds (runner host)
+**Policy: all builds and test runs that _can_ execute on the remote host
+_should_ execute there.** Use `localadmin@192.168.0.172` whenever the
+Gitea `macos_12` runner is not actively executing a workflow job.
+
+Test builds done as part of change implementations run on the CI runner
+host, not the dev machine — the runner is a macOS 12.7.6 **x86_64** VM
+with Xcode 14.2, and CI failures there are often environmental and do not
+reproduce locally.
+
+- Host: `localadmin@192.168.0.172` (SSH, LAN). Runner daemon:
+  `gitea-runner daemon -c /opt/gitea-runner/config.yaml`.
+- Credentials: `~/Projects/build-host.env` defines `BUILD_HOST_USER` /
+  `BUILD_HOST_PASSWORD`. **Never read or print this file** — load it with
+  `set -a; source ~/Projects/build-host.env; set +a` so values stay in the
+  environment.
+- `sshpass` is installed (`/usr/local/bin/sshpass`). Feed the password via
+  the `SSHPASS` env var — never on the command line:
+  ```sh
+  SSHPASS="$BUILD_HOST_PASSWORD" sshpass -e ssh localadmin@192.168.0.172 '<cmd>'
+  SSHPASS="$BUILD_HOST_PASSWORD" sshpass -e scp <local> localadmin@192.168.0.172:<remote>
+  ```
+  First connection needs `-o StrictHostKeyChecking=accept-new`.
+- Remote checkout: `~/Projects/iccery-v2-mac` (anonymous HTTPS clone works;
+  full history needed by `scripts/version.sh`). Before testing, sync it to
+  the same base commit as the local work:
+  `git fetch origin && git checkout <local base sha>`, then `scp` each
+  locally-changed file over its remote counterpart (uncommitted work
+  transfers this way — there is no push).
+- `xcodegen` is **not** on PATH: prepend
+  `$HOME/.local/xcodegen/2.38.0/xcodegen/bin` (prebuilt 2.38.0 installed
+  by `scripts/ensure-host-tools.sh`; brew's formula needs Xcode 15.3,
+  impossible on macOS 12 — #109).
+- Mirror `.gitea/workflows/macos.yml` exactly, from the repo root with
+  `DERIVED=build/DerivedData-test`:
+  `scripts/ensure-host-tools.sh` → `xcodegen generate --spec project.yml`
+  → `eval "$(scripts/version.sh)"` → `xcodebuild build-for-testing
+  -scheme ICCery -destination 'platform=macOS' -derivedDataPath "$DERIVED"
+  -configuration Debug ARCHS="$(uname -m)" ONLY_ACTIVE_ARCH=NO
+  CODE_SIGNING_ALLOWED=YES CODE_SIGN_IDENTITY='-' MARKETING_VERSION=…
+  CURRENT_PROJECT_VERSION=… ICCERY_RELEASE_TAG=…` → codesign every
+  `*_PackageProduct.framework` under `$DERIVED/Build/Products/Debug`
+  (#119) → `xcodebuild test-without-building -xctestrun <ICCery*.xctestrun>
+  -only-testing:ICCeryCoreTests -destination 'platform=macOS'
+  -derivedDataPath "$DERIVED"`.
+- Run **unit tests only** (`ICCeryCoreTests`). UI tests need a logged-in
+  GUI session and fail environmentally on the VM (runs 29700, 29804,
+  42183) — do not use them for verification unless asked.
+- xcodebuild takes minutes — run the ssh command in a background shell
+  and poll rather than blocking.
+
 ## Private ColorSync SPI
 2-arg `(PMPrintSession, CFStringRef) -> OSStatus`. Never pass integer `1`.
 Modes: `AP_ApplicationColorMatching` then `ApplicationColorMatching`.

Packages/ICCeryCore/Sources/ICCeryCore/Print/CupsOptionsFilter.swift

@@ -17,7 +17,8 @@ public enum CupsOptionsFilter {
         // Media
         "MediaType", "CNIJMediaType", "EPIJ_Medi", "StpMediaType",
         // Tray
-        "InputSlot", "AP_D_InputSlot",
+        "InputSlot", "MediaSource", "AP_D_InputSlot",
+        "EPIJ_FdSo", "EPIJ_PSrc", "CNIJMediaSupply",
         // Size
         "PageSize",
         // Colour bypass

Packages/ICCeryCore/Sources/ICCeryCore/Print/CupsParsers.swift

@@ -353,6 +353,55 @@ public enum CupsParsers {
             .map { $0 == "4" ? "landscape" : "portrait" }
     }
 
+    // MARK: - Tray detection (#218)
+
+    /// Paper-source option key in preference order. `EPIJ_FdSo` is
+    /// preferred over `EPIJ_PSrc` because Epson InkjetPrinter2 PPDs
+    /// label `EPIJ_FdSo` as "Paper Source" and `EPIJ_PSrc` as
+    /// "Page Setup" — the feed source is what Stage 2 should control.
+    /// `AP_D_InputSlot` is a capture-side alias only.
+    public static let trayKeys = [
+        "InputSlot", "MediaSource", "EPIJ_FdSo", "EPIJ_PSrc",
+        "CNIJMediaSupply"
+    ]
+
+    public static func detectTrayKey(optionKeys: Set<String>) -> String? {
+        trayKeys.first { optionKeys.contains($0) }
+    }
+
+    /// Extract a paper-source token from a captured `key=value` string.
+    /// If `preferredKey` is supplied and present, it wins; otherwise
+    /// every roster key is tried. `AP_D_InputSlot` is accepted as an
+    /// alias when it carries a non-empty value. Empty values are
+    /// ignored so an `AP_D_InputSlot=` placeholder never maps to a
+    /// selection (#218 capture-back).
+    public static func extractTray(
+        fromOptionsString options: String,
+        preferredKey: String? = nil
+    ) -> String? {
+        let pairs = lpoptions(options)
+        if let preferredKey,
+           let value = pairs.first(where: {
+               $0.key.caseInsensitiveCompare(preferredKey) == .orderedSame
+           })?.value, !value.isEmpty {
+            return value
+        }
+        for key in trayKeys {
+            if let value = pairs.first(where: {
+                $0.key.caseInsensitiveCompare(key) == .orderedSame
+            })?.value, !value.isEmpty {
+                return value
+            }
+        }
+        // Capture-side alias used by some macOS Core Printing paths.
+        if let value = pairs.first(where: {
+            $0.key.caseInsensitiveCompare("AP_D_InputSlot") == .orderedSame
+        })?.value, !value.isEmpty {
+            return value
+        }
+        return nil
+    }
+
     /// Driver "no colour adjustment" key=value for `lpoptions -l` keys
     /// (docs/11 layer ④): Canon `CNIJIntent2=4` else `CNIJIntent=4`;
     /// Epson `EPIJ_CCor=0` when the key exists else `EPIJ_CMat=3`;

Packages/ICCeryCore/Sources/ICCeryCore/Print/CupsService.swift

@@ -122,8 +122,28 @@ public struct CupsService: Sendable {
         let listings = try await optionListings(for: queue)
         let ppd = loadPPD(for: queue)
         var caps = capabilities(from: listings, ppd: ppd)
+        // Default queue-level map, then per-tray overrides (#218).
+        // Share one file-read cache across all contexts so multiple
+        // tray-token resolutions read Epson PDEData.dat only once.
+        var fileCache: [URL: Data] = [:]
+        let readFile: (URL) -> Data? = {
+            if let cached = fileCache[$0] { return cached }
+            guard let data = try? Data(contentsOf: $0) else { return nil }
+            fileCache[$0] = data
+            return data
+        }
         caps.qualityIDsByMediaType = MediaQualityConstraints.resolve(
-            listings: listings, ppd: ppd)
+            listings: listings, ppd: ppd,
+            optionOverrides: [:], readFile: readFile)
+        if let trayKey = caps.trayKey {
+            for tray in caps.trays {
+                let map = MediaQualityConstraints.resolve(
+                    listings: listings, ppd: ppd,
+                    optionOverrides: [trayKey: tray.token],
+                    readFile: readFile)
+                caps.qualityIDsByMediaTypeByTray[tray.token] = map
+            }
+        }
         return caps
     }
 
@@ -132,16 +152,12 @@ public struct CupsService: Sendable {
         from listings: [CupsOptionListing],
         ppd: String?
     ) -> PrinterCapabilities {
-        var trays: [PrinterTray] = []
+        let optionKeys = Set(listings.map(\.key))
         var sizes: [PrinterPaperSize] = []
         var media: [PrinterMediaType] = []
 
         for listing in listings {
             switch listing.key {
-            case "InputSlot", "MediaSource":
-                trays = listing.choices.enumerated().map {
-                    PrinterTray(id: $0.offset + 1, name: $0.element)
-                }
             case "PageSize", "MediaSize":
                 sizes = listing.choices.enumerated().map {
                     PrinterPaperSize(id: $0.offset + 1, name: $0.element)
@@ -159,12 +175,32 @@ public struct CupsService: Sendable {
             }
         }
 
+        // Paper source — one deterministic vendor roster key (#218).
+        let trayKey = CupsParsers.detectTrayKey(optionKeys: optionKeys)
+        let trays: [PrinterTray]
+        let trayDefault: String?
+        if let trayKey,
+           let listing = listings.first(where: { $0.key == trayKey }) {
+            let labels = ppd.map {
+                CupsParsers.ppdChoiceLabels($0, key: trayKey)
+            } ?? [:]
+            trays = listing.choices.enumerated().map {
+                PrinterTray(
+                    id: $0.offset + 1,
+                    token: $0.element,
+                    name: labels[$0.element] ?? $0.element)
+            }
+            trayDefault = listing.defaultChoice
+        } else {
+            trays = []
+            trayDefault = nil
+        }
+
         // Print quality — the detected roster key's listing maps to
         // `PrinterQuality` with PPD labels and the `*` default (#183).
         var qualities: [PrinterQuality] = []
         var qualityDefault: String?
-        let qualityKey = CupsParsers.detectQualityKey(
+        let qualityKey = CupsParsers.detectQualityKey(optionKeys: optionKeys)
-            optionKeys: Set(listings.map(\.key)))
         if let qualityKey,
            let listing = listings.first(where: { $0.key == qualityKey }) {
             let labels = ppd.map {
@@ -178,7 +214,8 @@ public struct CupsService: Sendable {
 
         return PrinterCapabilities(
             trays: trays, paperSizes: sizes, mediaTypes: media,
-            qualityKey: qualityKey, qualities: qualities,
+            trayKey: trayKey, qualityKey: qualityKey,
+            qualities: qualities, trayDefault: trayDefault,
             qualityDefault: qualityDefault)
     }
 

Packages/ICCeryCore/Sources/ICCeryCore/Print/MediaQualityConstraints.swift

@@ -32,6 +32,7 @@ public enum MediaQualityConstraints {
     public static func resolve(
         listings: [CupsOptionListing],
         ppd: String?,
+        optionOverrides: [String: String] = [:],
         readFile: (URL) -> Data? = { try? Data(contentsOf: $0) }
     ) -> [String: Set<String>] {
         let optionKeys = Set(listings.map(\.key))
@@ -46,9 +47,12 @@ public enum MediaQualityConstraints {
         else { return [:] }
         let mediaIDs = Set(mediaListing.choices)
         let qualityIDs = Set(qualityListing.choices)
-        let defaults = Dictionary(
+        var defaults = Dictionary(
             listings.compactMap { l in l.defaultChoice.map { (l.key, $0) } },
             uniquingKeysWith: { first, _ in first })
+        for (key, value) in optionOverrides {
+            defaults[key] = value
+        }
         guard let ppd else { return [:] }
 
         let ppdMap = allowedMap(

Packages/ICCeryCore/Sources/ICCeryCore/Print/PrinterModels.swift

@@ -48,13 +48,17 @@ public struct Printer: Codable, Equatable, Sendable {
 }
 
 /// Paper source. `id` is the 1-based index of the `InputSlot` /
-/// `MediaSource` choice (not a PPD code) — docs/10.
+/// `MediaSource` / vendor choice (not a PPD code); `token` is the
+/// exact CUPS/PPD machine value written to the ticket; `name` is the
+/// PPD-enriched display label (#218).
 public struct PrinterTray: Codable, Equatable, Sendable {
     public var id: Int
+    public var token: String
     public var name: String
 
-    public init(id: Int, name: String) {
+    public init(id: Int, token: String, name: String) {
         self.id = id
+        self.token = token
         self.name = name
     }
 }
@@ -101,10 +105,16 @@ public struct PrinterCapabilities: Codable, Equatable, Sendable {
     /// Always `true` on macOS (spec parity — CUPS honours
     /// `orientation-requested`).
     public var supportsOrientation: Bool
+    /// The queue's detected tray enumeration key
+    /// (`CupsParsers.detectTrayKey`), e.g. `EPIJ_FdSo` (#218).
+    public var trayKey: String?
     /// The queue's detected quality enumeration key
     /// (`CupsParsers.detectQualityKey`), e.g. `EPIJ_Qual` (#183).
     public var qualityKey: String?
     public var qualities: [PrinterQuality]
+    /// The `*`-marked default tray token from `lpoptions -l`, if any
+    /// (#218).
+    public var trayDefault: String?
     /// The `*`-marked default choice from `lpoptions -l`, if any.
     public var qualityDefault: String?
     /// Media-type id → the quality ids the driver accepts for it
@@ -112,50 +122,81 @@ public struct PrinterCapabilities: Codable, Equatable, Sendable {
     /// exposes no per-media quality matrix; a missing entry means
     /// "unconstrained" — show everything.
     public var qualityIDsByMediaType: [String: Set<String>]
+    /// Tray token → media-type id → allowed quality ids. Computed
+    /// once at capability load; a missing tray falls back to
+    /// `qualityIDsByMediaType` (#218).
+    public var qualityIDsByMediaTypeByTray: [String: [String: Set<String>]]
 
     public init(
         trays: [PrinterTray] = [],
         paperSizes: [PrinterPaperSize] = [],
         mediaTypes: [PrinterMediaType] = [],
         supportsOrientation: Bool = true,
+        trayKey: String? = nil,
         qualityKey: String? = nil,
         qualities: [PrinterQuality] = [],
+        trayDefault: String? = nil,
         qualityDefault: String? = nil,
-        qualityIDsByMediaType: [String: Set<String>] = [:]
+        qualityIDsByMediaType: [String: Set<String>] = [:],
+        qualityIDsByMediaTypeByTray: [String: [String: Set<String>]] = [:]
     ) {
         self.trays = trays
         self.paperSizes = paperSizes
         self.mediaTypes = mediaTypes
         self.supportsOrientation = supportsOrientation
+        self.trayKey = trayKey
         self.qualityKey = qualityKey
         self.qualities = qualities
+        self.trayDefault = trayDefault
         self.qualityDefault = qualityDefault
         self.qualityIDsByMediaType = qualityIDsByMediaType
+        self.qualityIDsByMediaTypeByTray = qualityIDsByMediaTypeByTray
     }
 
-    /// Qualities valid for `mediaID`, preserving the driver's listing
+    /// The quality map for the requested tray token, if any.
-    /// order (#180). Falls back to the full list when the driver has
+    /// Prefers the tray-specific map; otherwise falls back to the
-    /// no per-media data, the media is absent from the map, or the
+    /// queue-default map. An explicitly empty tray map means the tray
-    /// filter would empty the picker (#214).
+    /// is unconstrained, so `nil` is returned only when neither map
-    public func qualities(forMediaType mediaID: String?) -> [PrinterQuality] {
+    /// exists.
+    private func qualityMap(
+        forTrayToken trayToken: String?
+    ) -> [String: Set<String>]? {
+        if let trayToken,
+           let map = qualityIDsByMediaTypeByTray[trayToken],
+           !map.isEmpty {
+            return map
+        }
+        return qualityIDsByMediaType.isEmpty ? nil : qualityIDsByMediaType
+    }
+
+    /// Qualities valid for `mediaID` and an optional tray token,
+    /// preserving the driver's listing order (#180/#218). Falls back
+    /// to the full list when the driver has no per-media data, the
+    /// media is absent from the map, or the filter would empty the
+    /// picker (#214).
+    public func qualities(
+        forMediaType mediaID: String?,
+        trayToken: String? = nil
+    ) -> [PrinterQuality] {
         guard let mediaID,
-              let allowed = qualityIDsByMediaType[mediaID],
+              let allowed = qualityMap(forTrayToken: trayToken)?[mediaID],
               !allowed.isEmpty
         else { return qualities }
         let filtered = qualities.filter { allowed.contains($0.id) }
         return filtered.isEmpty ? qualities : filtered
     }
 
-    /// Whether `qualityID` is usable with `mediaID` — `true` whenever
+    /// Whether `qualityID` is usable with `mediaID` and an optional
-    /// the driver exposes no constraint for that media (#214). A
+    /// tray token (#218). A quality absent from `qualities` entirely
-    /// quality absent from `qualities` entirely is still allowed: a
+    /// is still allowed: a driver-captured token can be legitimate
-    /// driver-captured token can be legitimate even when `lpoptions`
+    /// even when `lpoptions` never listed it.
-    /// never listed it.
     public func allowsQuality(
-        _ qualityID: String, forMediaType mediaID: String?
+        _ qualityID: String,
+        forMediaType mediaID: String?,
+        trayToken: String? = nil
     ) -> Bool {
         guard let mediaID,
-              let allowed = qualityIDsByMediaType[mediaID],
+              let allowed = qualityMap(forTrayToken: trayToken)?[mediaID],
               !allowed.isEmpty
         else { return true }
         return allowed.contains(qualityID)

README.md

@@ -16,7 +16,7 @@ as AGPLv3 child processes. The GUI never `dlopen`s or links Argyll.
 |---|---|
 | Product | ICCery v2 for macOS |
 | Bundle | `com.gronod.iccery2` |
-| Version | 2.0.0 |
+| Version | 2.0.3 |
 | Floor | macOS 12.0 Monterey, universal `arm64` + `x86_64` |
 | Toolchain | Xcode 14.2 / Swift 5.7 (project `SWIFT_VERSION` is 5.0) |
 | CI | Gitea Actions `macos-12` runner |

Sources/ICCery/AppEnvironment.swift

@@ -133,17 +133,29 @@ enum UITestHooks {
     ///   `ICCERY_TEST_PANEL_OPTIONS` (captured `k=v` string) and
     ///   `ICCERY_TEST_PANEL_PRINTER` (selected queue; default = the
     ///   queue the panel was opened for).
-    static func printPanelResult(forQueue queue: String) -> PrintPropertiesResult? {
+    static func printPanelResult(
+        forQueue queue: String,
+        trays: [PrinterTray] = [],
+        preferredTrayKey: String? = nil
+    ) -> PrintPropertiesResult? {
         switch env["ICCERY_TEST_PRINT_PANEL"] {
         case "ok":
             let options = env["ICCERY_TEST_PANEL_OPTIONS"].flatMap {
                 $0.isEmpty ? nil : $0
             }
+            let trayToken = options.flatMap {
+                CupsParsers.extractTray(
+                    fromOptionsString: $0, preferredKey: preferredTrayKey)
+            }
+            let paperSource = trays.first(where: {
+                $0.token == trayToken
+            }).map(\.id)
             return PrintPropertiesResult(
                 selectedPrinter: env["ICCERY_TEST_PANEL_PRINTER"].flatMap {
                     $0.isEmpty ? nil : $0
                 } ?? queue,
                 options: PrintOptions(
+                    paperSource: paperSource,
                     orientation: options.flatMap {
                         CupsParsers.extractOrientation(fromOptionsString: $0)
                     },

Sources/ICCery/Print/ColorSyncSuppressor.swift

@@ -181,29 +181,44 @@ struct ColorSyncSuppressor {
 
     // MARK: - Layer ⑥ capture
 
-    /// `PMPrintSettingsToOptions` → filter → `(cupsOptions, mediaType)`.
+    /// `PMPrintSettingsToOptions` → filter → `(cupsOptions, mediaType,
-    /// The malloc'd C string is freed after copying.
+    /// tray)`. The malloc'd C string is freed after copying. `trayKey`
+    /// is the queue's detected tray enumeration key; if nil, the full
+    /// roster plus the capture-only `AP_D_InputSlot` alias is tried.
     func captureOptions(
-        from settings: PMPrintSettings
+        from settings: PMPrintSettings,
-    ) -> (cupsOptions: String?, mediaType: String?) {
+        trayKey: String?
-        guard let toOptions = optionsResolver() else {
+    ) -> (cupsOptions: String?, mediaType: String?, tray: String?) {
-            log("ColorSync: PMPrintSettingsToOptions unavailable — "
+        guard let unfiltered = rawOptionsDump(from: settings) else {
-                + "panel options not captured")
+            return (nil, nil, nil)
-            return (nil, nil)
         }
-        var raw: UnsafeMutablePointer<CChar>?
-        guard toOptions(settings, &raw) == 0, let raw else {
-            return (nil, nil)
-        }
-        defer { free(raw) }
-        let unfiltered = String(cString: raw)
         let filtered = CupsOptionsFilter.filter(unfiltered)
         return (
             filtered.isEmpty ? nil : filtered,
-            CupsParsers.extractMediaType(fromOptionsString: unfiltered)
+            CupsParsers.extractMediaType(fromOptionsString: unfiltered),
+            CupsParsers.extractTray(
+                fromOptionsString: unfiltered,
+                preferredKey: trayKey)
         )
     }
 
+    /// Unfiltered `PMPrintSettingsToOptions` output — the diagnostics
+    /// half of the capture path (#217 `ICCERY_DEBUG_PANEL_DUMP`).
+    /// `nil` when the symbol or the call fails.
+    func rawOptionsDump(from settings: PMPrintSettings) -> String? {
+        guard let toOptions = optionsResolver() else {
+            log("ColorSync: PMPrintSettingsToOptions unavailable — "
+                + "panel options not captured")
+            return nil
+        }
+        var raw: UnsafeMutablePointer<CChar>?
+        guard toOptions(settings, &raw) == 0, let raw else {
+            return nil
+        }
+        defer { free(raw) }
+        return String(cString: raw)
+    }
+
     // MARK: - dlsym
 
     private static func dlsymMode(_ name: String) -> ColorMatchingModeFunction? {

Sources/ICCery/Print/PrintPanelService.swift

@@ -21,6 +21,10 @@ struct PrintPanelInitialSelections {
     /// CUPS `PageSize` token, e.g. `"A4"` / `"Custom.595x842"`. Written
     /// to `PMPrintSettings` **and** `PMPageFormat` (#186 E1).
     var paperSize: String?
+    /// The queue's detected tray enumeration key, e.g. `EPIJ_FdSo`.
+    var trayKey: String?
+    /// The selected tray machine token.
+    var tray: String?
     /// The queue's detected quality enumeration key, e.g. `EPIJ_Qual`.
     var qualityKey: String?
     /// The selected quality token.
@@ -32,6 +36,23 @@ struct PrintPanelInitialSelections {
     var orientation: String?
 }
 
+/// One bound-panel invocation (#217): the queue, its `lpoptions -l`
+/// key roster, the Stage 2 pre-selections, and the session's captured
+/// ticket — everything `makePanelPrintInfo` needs before the modal.
+struct PrintPanelRequest {
+    let queue: String
+    let displayName: String?
+    let optionKeys: Set<String>
+    let initialSelections: PrintPanelInitialSelections
+    /// The queue's previously captured ticket — rehydrated before the
+    /// Stage 2 writes so vendor PDE state survives a reopen (#217).
+    let ticket: PrintTicket?
+    /// Roster of paper-source choices used to map a captured option
+    /// token back to a 1-based ID. Empty for queues with no tray key
+    /// (#218).
+    let trays: [PrinterTray]
+}
+
 /// Preferences → native `NSPrintPanel` bound to the selected CUPS
 /// queue (issue 13, docs/11).
 ///
@@ -58,11 +79,16 @@ struct PrintPanelService {
         displayName: String?,
         cupsService: CupsService,
         initialSelections: PrintPanelInitialSelections =
-            PrintPanelInitialSelections()
+            PrintPanelInitialSelections(),
+        ticket: PrintTicket? = nil,
+        trays: [PrinterTray] = []
     ) async throws -> PanelCaptureResult? {
         #if DEBUG
         if UITestHooks.printPanelStubbed {
-            return UITestHooks.printPanelResult(forQueue: queue).map {
+            return UITestHooks.printPanelResult(
+                forQueue: queue, trays: trays,
+                preferredTrayKey: initialSelections.trayKey
+            ).map {
                 PanelCaptureResult(properties: $0, ticket: nil)
             }
         }
@@ -75,83 +101,140 @@ struct PrintPanelService {
         let optionKeys = (try? await cupsService.optionKeys(for: queue))
             ?? []
         return try runNativePanel(
-            queue: queue, displayName: display, optionKeys: optionKeys,
+            PrintPanelRequest(
-            initialSelections: initialSelections)
+                queue: queue, displayName: display,
+                optionKeys: optionKeys,
+                initialSelections: initialSelections, ticket: ticket,
+                trays: trays))
     }
 
     // MARK: - Panel
 
-    private func runNativePanel(
+    /// The pre-modal half of `runNativePanel` — a fully configured
-        queue: String,
+    /// `NSPrintInfo` plus the `boundViaPM` flag. Extracted (same
-        displayName: String?,
+    /// pattern as `NativeTargetSpooler.makePrintInfo`) so unit tests
-        optionKeys: Set<String>,
+    /// assert ticket restore / Stage 2 precedence without driving the
-        initialSelections: PrintPanelInitialSelections
+    /// modal (#217). The caller owns `printer` — it must stay alive
-    ) throws -> PanelCaptureResult? {
+    /// through the modal.
+    func makePanelPrintInfo(
+        for request: PrintPanelRequest,
+        boundTo printer: PMPrinter?
+    ) throws -> (printInfo: NSPrintInfo, boundViaPM: Bool) {
         let printInfo = NSPrintInfo()
-        var pmPrinter: PMPrinter?
-        var boundViaPM = false
 
         // ① Bind the session to the selected CUPS queue (docs/11).
-        if let printer = PMTicketBridge.makePrinter(queue: queue) {
+        if let printer {
-            pmPrinter = printer
-            let session = PMTicketBridge.session(printInfo)
-            let settings = PMTicketBridge.settings(printInfo)
-
-            do {
             try PMTicketBridge.bind(printer: printer, to: printInfo)
-            } catch {
+            configureBoundPanel(
-                PMTicketBridge.release(printer)
+                printInfo, request: request, printer: printer)
-                throw error
-            }
-            // Initial selections — after `PMSessionDefault*`, before
-            // ColorSync suppression ②–⑤ (locked write order,
-            // #183/#186). Paper is TWO writes (E1): the `PageSize`
-            // print-settings value drivers/capture read AND the
-            // `PMPageFormat` paper the panel's dropdown reflects.
-            applyInitialSelections(
-                initialSelections, to: settings, optionKeys: optionKeys)
-            if let paperToken = initialSelections.paperSize {
-                PMTicketBridge.applyPaper(
-                    token: paperToken, printer: printer,
-                    session: session, printInfo: printInfo)
-            }
-            boundViaPM = true
         } else {
             // Fallback: NSPrinter by display name (docs/11 §binding).
             // Warn — the display name can resolve a *different* queue
             // (#186 E2: diagnosable, not a proven defect).
             AppLogger.shared.warn(
-                "Print panel: PM binding unavailable for '\(queue)' — "
+                "Print panel: PM binding unavailable for "
+                    + "'\(request.queue)' — "
                     + "falling back to NSPrinter(displayName)")
-            guard let displayName,
+            guard let displayName = request.displayName,
                   let nsPrinter = NSPrinter(name: displayName)
             else {
                 throw PrintPanelError.noPrinterFound(
-                    displayName ?? queue)
+                    request.displayName ?? request.queue)
             }
             printInfo.printer = nsPrinter
             printInfo.setUpPrintOperationDefaultValues()
+            return (printInfo, false)
         }
+
+        return (printInfo, true)
+    }
+
+    /// Post-bind configuration in locked order (#217 — mirrors the
+    /// spooler's S4→S7): ticket restore → Stage 2 selections →
+    /// validate → paper → suppression ②–⑤. Internal so unit tests can
+    /// drive it with `printer: nil` — `applyPaper` and the SPI layer
+    /// need a bound printer and skip when it is absent, while ticket
+    /// restore / selections / validate still run on the session-less
+    /// `NSPrintInfo`.
+    func configureBoundPanel(
+        _ printInfo: NSPrintInfo,
+        request: PrintPanelRequest,
+        printer: PMPrinter?
+    ) {
+        let session = PMTicketBridge.session(printInfo)
+        let settings = PMTicketBridge.settings(printInfo)
+
+        // Rehydrate the captured ticket *before* the Stage 2 writes
+        // (#217 — restore-then-override). Warn-only, unlike the
+        // spooler's fatal `try`: a stale/corrupt ticket must not keep
+        // the dialog from opening. `restore` itself refuses a
+        // cross-queue replay (R3).
+        if let ticket = request.ticket {
+            do {
+                try PMTicketBridge.restore(ticket, into: printInfo)
+            } catch {
+                AppLogger.shared.warn(
+                    "Print panel: ticket restore failed — "
+                        + "opening on queue defaults "
+                        + "(\(error.localizedDescription))")
+            }
+        }
+
+        // Initial selections — Stage 2 wins over the restored ticket
+        // (D6 parity). Paper is TWO writes (E1): the `PageSize`
+        // print-settings value drivers/capture read AND the
+        // `PMPageFormat` paper the panel's dropdown reflects.
+        applyInitialSelections(
+            request.initialSelections, to: settings,
+            optionKeys: request.optionKeys)
+
+        // Reconcile the pre-writes into the ticket before the modal
+        // (#217 RC2): the vendor PDE derives pane state from a
+        // validated ticket. Warn-only — log when the driver adjusts
+        // so a companion-key desync is diagnosable.
+        var changed = DarwinBoolean(false)
+        _ = PMSessionValidatePrintSettings(session, settings, &changed)
+        if changed.boolValue {
+            AppLogger.shared.info(
+                "Print panel: driver adjusted the pre-selections")
+        }
+        printInfo.updateFromPMPrintSettings()
+
+        if let printer, let paperToken = request.initialSelections.paperSize {
+            PMTicketBridge.applyPaper(
+                token: paperToken, printer: printer,
+                session: session, printInfo: printInfo)
+        }
+
+        // ②–⑤ ColourSync suppression. The SPI needs a session with a
+        // current printer to attach to; the SetValue/mirror layers
+        // are warn-only and run regardless.
+        if printer != nil {
+            suppressor.applySPIMode(to: session)                // ②
+        }
+        suppressor.applyLockedKeys(to: settings)                // ③
+        suppressor.applyQuartzMode(to: settings)                // ⑤′-a (D2)
+        let driverBypass = suppressor.applyDriverBypass(        // ④
+            to: settings, optionKeys: request.optionKeys)
+        suppressor.mirror(into: printInfo, driverBypass: driverBypass) // ⑤
+    }
+
+    private func runNativePanel(
+        _ request: PrintPanelRequest
+    ) throws -> PanelCaptureResult? {
+        // The PM printer handle is held through the modal and
+        // released on every path.
+        let pmPrinter = PMTicketBridge.makePrinter(queue: request.queue)
         defer {
             if let printer = pmPrinter {
                 PMTicketBridge.release(printer)
             }
         }
 
-        // ②–⑤ ColourSync suppression — only on the PM path: the SPI
+        let (printInfo, boundViaPM) = try makePanelPrintInfo(
-        // and PMPrintSettingsSetValue need a session with a current
+            for: request, boundTo: pmPrinter)
-        // printer to attach to.
+
-        var settings = PMTicketBridge.settings(printInfo)
+        debugDump(printInfo, when: "pre-modal")
-        var driverBypass: (key: String, value: String)?
-        if boundViaPM {
-            let session = PMTicketBridge.session(printInfo)
-            suppressor.applySPIMode(to: session)                    // ②
-            suppressor.applyLockedKeys(to: settings)                // ③
-            suppressor.applyQuartzMode(to: settings)                // ⑤′-a (D2)
-            driverBypass = suppressor.applyDriverBypass(            // ④
-                to: settings, optionKeys: optionKeys)
-            suppressor.mirror(into: printInfo, driverBypass: driverBypass) // ⑤
-        }
 
         let panel = NSPrintPanel()
         panel.options = [
@@ -173,27 +256,35 @@ struct PrintPanelService {
         // (#183); the PDE may rewrite or drop them (R12).
         var cupsOptions: String?
         var mediaType: String?
+        var trayToken: String?
         if boundViaPM {
-            settings = PMTicketBridge.settings(printInfo)
+            debugDump(printInfo, when: "post-OK")
-            let captured = suppressor.captureOptions(from: settings)
+            let captured = suppressor.captureOptions(
+                from: PMTicketBridge.settings(printInfo),
+                trayKey: request.initialSelections.trayKey)
             cupsOptions = captured.cupsOptions
             mediaType = captured.mediaType
+            trayToken = captured.tray
         }
         let capturedOptions = cupsOptions ?? ""
         let resolvedQueue = boundViaPM
             ? PMTicketBridge.currentPrinterID(
                 session: PMTicketBridge.session(printInfo),
-                fallback: queue)
+                fallback: request.queue)
-            : queue
+            : request.queue
         // ⑦ Serialise the native ticket — the payload `lp -o` could
         // never carry (#201). Warn-only via `try?`: a serialise
         // failure must not lose the Stage 2 mirror above.
         let ticket = try? PMTicketBridge.serialise(
             printInfo, queue: resolvedQueue)
+        let paperSource = request.trays.first(where: {
+            $0.token == trayToken
+        }).map(\.id)
         return PanelCaptureResult(
             properties: PrintPropertiesResult(
                 selectedPrinter: boundViaPM ? resolvedQueue : nil,
                 options: PrintOptions(
+                    paperSource: paperSource,
                     orientation: CupsParsers.extractOrientation(
                         fromOptionsString: capturedOptions),
                     paperSize: CupsParsers.extractOption(
@@ -207,10 +298,10 @@ struct PrintPanelService {
             ticket: ticket)
     }
 
-    /// Initial-selection `PMPrintSettings` writes — paper, quality,
+    /// Initial-selection `PMPrintSettings` writes — paper, tray,
-    /// media type, orientation. All warn-only: a driver that ignores
+    /// quality, media type, orientation. All warn-only: a driver that
-    /// a key must not keep the panel from opening (R12 surfaces via
+    /// ignores a key must not keep the panel from opening (R12 surfaces
-    /// the capture echo instead).
+    /// via the capture echo instead).
     private func applyInitialSelections(
         _ selections: PrintPanelInitialSelections,
         to settings: PMPrintSettings,
@@ -221,6 +312,13 @@ struct PrintPanelService {
                 paperSize, forKey: "PageSize", locked: false,
                 in: settings, context: "Print panel")
         }
+        // Paper source via the queue's detected tray roster key (#218).
+        if let tray = selections.tray, !tray.isEmpty,
+           let trayKey = selections.trayKey {
+            PMTicketBridge.setValue(
+                tray, forKey: trayKey, locked: false,
+                in: settings, context: "Print panel")
+        }
         if let key = selections.qualityKey, let value = selections.quality {
             PMTicketBridge.setValue(
                 value, forKey: key, locked: false,
@@ -243,4 +341,35 @@ struct PrintPanelService {
         }
     }
 
+    /// `ICCERY_DEBUG_PANEL_DUMP=1` — log the unfiltered
+    /// `PMPrintSettingsToOptions` output and the serialised
+    /// settings/page-format byte counts (#217 diagnostics for the
+    /// Epson RC3 question: does the PDE source pane state from the
+    /// session ticket or lpoptions?). DEBUG-only, warn-only.
+    private func debugDump(_ printInfo: NSPrintInfo, when phase: String) {
+        #if DEBUG
+        guard ProcessInfo.processInfo.environment[
+            "ICCERY_DEBUG_PANEL_DUMP"] == "1" else { return }
+        let raw = suppressor.rawOptionsDump(
+            from: PMTicketBridge.settings(printInfo)) ?? "<unavailable>"
+        var settingsSize = -1
+        var ref: Unmanaged<CFData>?
+        if PMPrintSettingsCreateDataRepresentation(
+            PMTicketBridge.settings(printInfo), &ref,
+            kPMDataFormatXMLDefault) == noErr, let ref {
+            settingsSize = (ref.takeRetainedValue() as Data).count
+        }
+        var formatSize = -1
+        var formatRef: Unmanaged<CFData>?
+        if PMPageFormatCreateDataRepresentation(
+            PMTicketBridge.pageFormat(printInfo), &formatRef,
+            kPMDataFormatXMLDefault) == noErr, let formatRef {
+            formatSize = (formatRef.takeRetainedValue() as Data).count
+        }
+        AppLogger.shared.info(
+            "Print panel dump (\(phase)): settings=\(settingsSize)B "
+                + "pageFormat=\(formatSize)B options: \(raw)")
+        #endif
+    }
+
 }

Sources/ICCery/Print/PrintSessionViewModel.swift

@@ -24,7 +24,15 @@ final class PrintSessionViewModel: ObservableObject {
         }
     }
     @Published var printerCaps = PrinterCapabilities()
-    @Published var selectedTray: Int?
+    @Published var selectedTray: Int? {
+        didSet {
+            // A tray switch can invalidate the current quality pick
+            // using the tray-specific Epson constraint map (#218).
+            if selectedTray != oldValue {
+                clampQualityToMedia()
+            }
+        }
+    }
     @Published var selectedMediaType: String? {
         didSet {
             // A media switch can invalidate the current quality pick —
@@ -128,8 +136,11 @@ final class PrintSessionViewModel: ObservableObject {
             if selectedMediaType == nil {
                 selectedMediaType = printerCaps.mediaTypes.first?.id
             }
-            if selectedTray == nil {
+            if selectedTray == nil || !printerCaps.trays
-                selectedTray = printerCaps.trays.first?.id
+                .contains(where: { $0.id == selectedTray }) {
+                selectedTray = printerCaps.trayDefault.flatMap { token in
+                    printerCaps.trays.first { $0.token == token }?.id
+                } ?? printerCaps.trays.first?.id
             }
             // Quality seeds inside the selected media's allowed set
             // (#214): driver default when valid there, else the first
@@ -152,17 +163,26 @@ final class PrintSessionViewModel: ObservableObject {
 
     // MARK: - Paper / quality selection (#183)
 
-    /// The quality picker's source (#214): `printerCaps.qualities`
+    /// The raw tray token for the currently selected source (#218).
-    /// filtered to what the driver accepts for `selectedMediaType`.
+    var selectedTrayToken: String? {
-    /// Equals the full list whenever the queue exposes no per-media
+        guard let id = selectedTray else { return nil }
-    /// quality matrix — and never empty while `qualities` is not.
+        return printerCaps.trays.first { $0.id == id }?.token
+    }
+
+    /// The quality picker's source (#214/#218): `printerCaps.qualities`
+    /// filtered to what the driver accepts for `selectedMediaType` and
+    /// the current tray token. Equals the full list whenever the queue
+    /// exposes no per-media/per-tray quality matrix — and never empty
+    /// while `qualities` is not.
     var availableQualities: [PrinterQuality] {
-        printerCaps.qualities(forMediaType: selectedMediaType)
+        printerCaps.qualities(
+            forMediaType: selectedMediaType,
+            trayToken: selectedTrayToken)
     }
 
     /// Keep `selectedQuality` inside the allowed set for the current
-    /// media: keep the pick when still valid, else the driver default
+    /// media and tray: keep the pick when still valid, else the driver
-    /// when valid, else the first allowed choice (#214).
+    /// default when valid, else the first allowed choice (#214/#218).
     private func clampQualityToMedia() {
         let allowed = availableQualities
         guard !allowed.isEmpty else { return }
@@ -178,6 +198,15 @@ final class PrintSessionViewModel: ObservableObject {
         }
     }
 
+    /// The tray token for a captured option string, used both for
+    /// applying panel results and for synthesising unknown selections.
+    private func capturedTrayToken(from options: String?) -> String? {
+        guard let options else { return nil }
+        return CupsParsers.extractTray(
+            fromOptionsString: options,
+            preferredKey: printerCaps.trayKey)
+    }
+
     /// Seed `selectedPaperSize` from Stage 1's `workflow.pageSize`:
     /// a capability whose name matches `pageSize.rawValue` → its id;
     /// `.custom` → the synthetic `Custom.<pt>x<pt>` entry (`id: 0`);
@@ -227,17 +256,22 @@ final class PrintSessionViewModel: ObservableObject {
         let cups = environment.cupsService
         let selections = PrintPanelInitialSelections(
             paperSize: selectedPaperSizeToken,
+            trayKey: printerCaps.trayKey,
+            tray: selectedTrayToken,
             qualityKey: printerCaps.qualityKey,
             quality: selectedQuality,
             mediaType: selectedMediaType,
             orientation: printOrientation)
+        let ticket = capturedTickets[queue]
         Task { @MainActor in
             do {
                 guard let result = try await PrintPanelService()
                     .showProperties(
                         queue: queue, displayName: displayName,
                         cupsService: cups,
-                        initialSelections: selections)
+                        initialSelections: selections,
+                        ticket: ticket,
+                        trays: printerCaps.trays)
                 else {
                     printNotice = Notice(
                         kind: .info,
@@ -262,6 +296,28 @@ final class PrintSessionViewModel: ObservableObject {
                 if let media = result.properties.options.mediaType {
                     selectedMediaType = media
                 }
+                // Capture-return paper source (#218): a dialog tray
+                // change updates Stage 2; unknown tokens are appended
+                // so a driver-only source remains selectable.
+                if let options = result.properties.options.cupsOptions,
+                   let trayToken = capturedTrayToken(from: options),
+                   !trayToken.isEmpty {
+                    if let known = printerCaps.trays
+                        .first(where: { $0.token == trayToken }) {
+                        selectedTray = known.id
+                    } else {
+                        let nextID = (printerCaps.trays.map(\.id).max() ?? 0) + 1
+                        let synthetic = PrinterTray(
+                            id: nextID, token: trayToken, name: trayToken)
+                        printerCaps.trays.append(synthetic)
+                        selectedTray = nextID
+                    }
+                } else if let paperSource = result.properties.options.paperSource,
+                          printerCaps.trays.contains(where: {
+                              $0.id == paperSource
+                          }) {
+                    selectedTray = paperSource
+                }
                 // Capture-return (#183/#186): a dialog paper/quality/
                 // orientation change updates the Stage 2 selections —
                 // never `workflow.pageSize` (printtarg layout is
@@ -410,7 +466,9 @@ final class PrintSessionViewModel: ObservableObject {
         // the last gate before the driver).
         var quality = selectedQuality
         if let q = quality,
-           !printerCaps.allowsQuality(q, forMediaType: selectedMediaType) {
+           !printerCaps.allowsQuality(
+               q, forMediaType: selectedMediaType,
+               trayToken: selectedTrayToken) {
             quality = availableQualities.first?.id ?? q
         }
         return TargetPrintRequest(
@@ -429,6 +487,8 @@ final class PrintSessionViewModel: ObservableObject {
                 mediaType: selectedMediaType,
                 qualityKey: printerCaps.qualityKey,
                 quality: quality,
+                trayKey: printerCaps.trayKey,
+                tray: selectedTrayToken,
                 orientation: printOrientation),
             optionKeys: optionKeys)
     }

Sources/ICCery/Print/TicketWriteResolver.swift

@@ -8,6 +8,8 @@ struct TargetPrintOverrides: Equatable {
     var mediaType: String?
     var qualityKey: String?     // PrinterCapabilities.qualityKey
     var quality: String?
+    var trayKey: String?        // PrinterCapabilities.trayKey
+    var tray: String?           // raw tray token (#218)
     var orientation: String?    // "portrait" | "landscape"
 }
 
@@ -42,10 +44,11 @@ enum TicketWriteResolver {
     ///  5 `com.apple.print.PrintSettings.PMColorMatchingMode`
     ///                                    = APCustomColorMatching        (unlocked)
     ///  6 `PageSize`                      = overrides.paperSize
-    ///  7 detectMediaTypeKey(optionKeys)  = overrides.mediaType
+    ///  7 overrides.trayKey               = overrides.tray
-    ///  8 overrides.qualityKey            = overrides.quality
+    ///  8 detectMediaTypeKey(optionKeys)  = overrides.mediaType
-    ///  9 detectDriverColorBypass(optionKeys)                            (unlocked)
+    ///  9 overrides.qualityKey            = overrides.quality
-    /// 10 `orientation-requested`         = 3 | 4
+    /// 10 detectDriverColorBypass(optionKeys)                            (unlocked)
+    /// 11 `orientation-requested`         = 3 | 4
     ///
     /// Invariants: `raw` can never appear (there is no `lp`); nothing
     /// is suppressed because a captured key already exists (D6 — the
@@ -87,7 +90,14 @@ enum TicketWriteResolver {
                 key: "PageSize", value: paperSize, locked: false))
         }
 
-        // 7 — media type via the queue's detected vendor key.
+        // 7 — paper source via the queue's detected tray roster key.
+        if let trayKey = overrides.trayKey, !trayKey.isEmpty,
+           let tray = overrides.tray, !tray.isEmpty {
+            writes.append(TicketWrite(
+                key: trayKey, value: tray, locked: false))
+        }
+
+        // 8 — media type via the queue's detected vendor key.
         if let mediaType = overrides.mediaType,
            let mediaKey = CupsParsers.detectMediaTypeKey(
                optionKeys: optionKeys) {
@@ -95,7 +105,7 @@ enum TicketWriteResolver {
                 key: mediaKey, value: mediaType, locked: false))
         }
 
-        // 8 — print quality; the detected enumeration key travels in
+        // 9 — print quality; the detected enumeration key travels in
         // the overrides (`PrinterCapabilities.qualityKey`, #183).
         if let qualityKey = overrides.qualityKey,
            let quality = overrides.quality {
@@ -103,7 +113,7 @@ enum TicketWriteResolver {
                 key: qualityKey, value: quality, locked: false))
         }
 
-        // 9 — driver "no colour adjustment" bypass. Never gated on
+        // 10 — driver "no colour adjustment" bypass. Never gated on
         // `ppdUncorrectedPassthrough` — macOS always bypasses.
         if let bypass = CupsParsers.detectDriverColorBypass(
             optionKeys: optionKeys) {
@@ -111,7 +121,7 @@ enum TicketWriteResolver {
                 key: bypass.key, value: bypass.value, locked: false))
         }
 
-        // 10 — orientation, CUPS IPP codes portrait=3 / landscape=4.
+        // 11 — orientation, CUPS IPP codes portrait=3 / landscape=4.
         if let orientation = overrides.orientation {
             writes.append(TicketWrite(
                 key: "orientation-requested",

Sources/ICCery/Stage2View.swift

@@ -297,7 +297,7 @@ struct Stage2View: View {
             // ViewBuilder ≤10 children (R13).
             HStack(spacing: 14) {
                 if !workflow.print.printerCaps.trays.isEmpty {
-                    Picker("Tray", selection: $workflow.print.selectedTray) {
+                    Picker("Paper source", selection: $workflow.print.selectedTray) {
                         ForEach(workflow.print.printerCaps.trays, id: \.id) {
                             Text($0.name).tag(Optional($0.id))
                         }
@@ -322,16 +322,12 @@ struct Stage2View: View {
                 if !workflow.print.printerCaps.qualities.isEmpty {
                     qualityGroup
                 }
-                HStack(spacing: 0) {
+                Picker("Orientation", selection: $workflow.print.printOrientation) {
-                    Button("Portrait") { workflow.print.printOrientation = "portrait" }
+                    Text("Portrait").tag("portrait")
-                        .buttonStyle(.bordered)
+                    Text("Landscape").tag("landscape")
-                        .tint(workflow.print.printOrientation == "portrait" ? .accentColor : .gray)
-                        .accessibilityIdentifier("btnOrientPortrait")
-                    Button("Landscape") { workflow.print.printOrientation = "landscape" }
-                        .buttonStyle(.bordered)
-                        .tint(workflow.print.printOrientation == "landscape" ? .accentColor : .gray)
-                        .accessibilityIdentifier("btnOrientLandscape")
                 }
+                .frame(maxWidth: 200)
+                .accessibilityIdentifier("printerOrientationSelect")
                 Spacer()
             }
             // Stage 1 owns the custom dimensions — the caption lives

Tests/ICCeryCoreTests/CupsOptionsFilterTests.swift

@@ -54,6 +54,28 @@ final class CupsOptionsFilterTests: XCTestCase {
         XCTAssertNil(CupsParsers.extractMediaType(
             fromOptionsString: "PageSize=A4"))
     }
+
+    /// #218 — vendor paper-source keys survive the filter, and an
+    /// empty `AP_D_InputSlot=` is still dropped.
+    func testKeepsTrayKeys() {
+        let raw = "InputSlot=Rear MediaSource=Front EPIJ_FdSo=Rear "
+            + "EPIJ_PSrc=Front CNIJMediaSupply=1 AP_D_InputSlot=Auto"
+        XCTAssertEqual(CupsOptionsFilter.filter(raw), raw)
+
+        let emptyAlias = "AP_D_InputSlot= InputSlot=Rear"
+        XCTAssertEqual(CupsOptionsFilter.filter(emptyAlias), "InputSlot=Rear")
+    }
+
+    func testExtractTray() {
+        XCTAssertEqual(CupsParsers.extractTray(
+            fromOptionsString: "EPIJ_FdSo=Rear EPIJ_PSrc=Front",
+            preferredKey: "EPIJ_FdSo"), "Rear")
+        XCTAssertEqual(CupsParsers.extractTray(
+            fromOptionsString: "AP_D_InputSlot=Auto InputSlot=Rear",
+            preferredKey: "InputSlot"), "Rear")
+        XCTAssertNil(CupsParsers.extractTray(
+            fromOptionsString: "PageSize=A4"))
+    }
 }
 
 /// Issue 14 — the dlsym attempt order and first-success semantics.

Tests/ICCeryCoreTests/CupsParserTests.swift

@@ -83,11 +83,13 @@ final class CupsParserTests: XCTestCase {
         let caps = service.capabilities(from: listings, ppd: nil)
 
         XCTAssertEqual(caps.trays, [
-            PrinterTray(id: 1, name: "Auto"),
+            PrinterTray(id: 1, token: "Auto", name: "Auto"),
-            PrinterTray(id: 2, name: "Main"),
+            PrinterTray(id: 2, token: "Main", name: "Main"),
-            PrinterTray(id: 3, name: "Photo"),
+            PrinterTray(id: 3, token: "Photo", name: "Photo"),
-            PrinterTray(id: 4, name: "Rear"),
+            PrinterTray(id: 4, token: "Rear", name: "Rear"),
         ])
+        XCTAssertEqual(caps.trayKey, "InputSlot")
+        XCTAssertEqual(caps.trayDefault, "Main")
         XCTAssertEqual(caps.paperSizes.first, PrinterPaperSize(id: 1, name: "3.5x5"))
         XCTAssertEqual(caps.paperSizes.count, 10)
         XCTAssertEqual(caps.mediaTypes.map(\.id), [
@@ -283,6 +285,82 @@ final class CupsParserTests: XCTestCase {
         XCTAssertNil(pair(["PageSize"]))
     }
 
+    // MARK: - #218 paper-source roster
+
+    func testTrayKeyPrecedence() {
+        // Generic keys first; `EPIJ_FdSo` preferred over `EPIJ_PSrc`.
+        XCTAssertEqual(CupsParsers.detectTrayKey(optionKeys: [
+            "InputSlot", "EPIJ_FdSo", "EPIJ_PSrc"]), "InputSlot")
+        XCTAssertEqual(CupsParsers.detectTrayKey(optionKeys: [
+            "MediaSource", "EPIJ_FdSo", "EPIJ_PSrc"]), "MediaSource")
+        XCTAssertEqual(CupsParsers.detectTrayKey(optionKeys: [
+            "EPIJ_FdSo", "EPIJ_PSrc"]), "EPIJ_FdSo")
+        XCTAssertEqual(CupsParsers.detectTrayKey(optionKeys: [
+            "EPIJ_PSrc", "CNIJMediaSupply"]), "EPIJ_PSrc")
+        XCTAssertEqual(CupsParsers.detectTrayKey(optionKeys: [
+            "CNIJMediaSupply"]), "CNIJMediaSupply")
+        XCTAssertNil(CupsParsers.detectTrayKey(optionKeys: ["PageSize"]))
+    }
+
+    func testExtractTrayPreferredKeyAndRoster() {
+        let preferred = CupsParsers.extractTray(
+            fromOptionsString: "EPIJ_FdSo=Rear EPIJ_PSrc=Front",
+            preferredKey: "EPIJ_FdSo")
+        XCTAssertEqual(preferred, "Rear")
+
+        let fallback = CupsParsers.extractTray(
+            fromOptionsString: "EPIJ_PSrc=Front", preferredKey: "EPIJ_FdSo")
+        XCTAssertEqual(fallback, "Front")
+
+        let alias = CupsParsers.extractTray(
+            fromOptionsString: "AP_D_InputSlot=Auto")
+        XCTAssertEqual(alias, "Auto")
+
+        XCTAssertNil(CupsParsers.extractTray(
+            fromOptionsString: "PageSize=A4"))
+        XCTAssertNil(CupsParsers.extractTray(
+            fromOptionsString: "AP_D_InputSlot="))
+    }
+
+    func testTrayExtractionCaseInsensitive() {
+        XCTAssertEqual(CupsParsers.extractTray(
+            fromOptionsString: "epij_fdso=Rear", preferredKey: "EPIJ_FdSo"),
+            "Rear")
+    }
+
+    func testCapabilitiesTraysEpson() {
+        let service = CupsService()
+        let listings = CupsParsers.lpoptionsList("""
+            EPIJ_PSrc/Page Setup: *Front Rear Cassette
+            EPIJ_FdSo/Paper Source: Auto *Rear Front
+            """)
+        let caps = service.capabilities(from: listings, ppd: nil)
+
+        XCTAssertEqual(caps.trayKey, "EPIJ_FdSo")
+        XCTAssertEqual(caps.trayDefault, "Rear")
+        XCTAssertEqual(caps.trays.map(\.token), ["Auto", "Rear", "Front"])
+        XCTAssertEqual(caps.trays.map(\.name), ["Auto", "Rear", "Front"])
+    }
+
+    func testCapabilitiesTraysCanon() {
+        let ppd = """
+            *CNIJMediaSupply 1/Cassette (Upper): ""
+            *CNIJMediaSupply 2/Manual Feed: ""
+            *CNIJMediaSupply 4/Rear Tray: ""
+            """
+        let service = CupsService()
+        let listings = CupsParsers.lpoptionsList("""
+            CNIJMediaSupply/Media Supply: *1 2 4
+            """)
+        let caps = service.capabilities(from: listings, ppd: ppd)
+
+        XCTAssertEqual(caps.trayKey, "CNIJMediaSupply")
+        XCTAssertEqual(caps.trays.map(\.token), ["1", "2", "4"])
+        XCTAssertEqual(caps.trays.map(\.name), [
+            "Cassette (Upper)", "Manual Feed", "Rear Tray"
+        ])
+    }
+
     // MARK: - #181 Canon media locale precedence + PPD encoding
 
     /// The 18 Canon Pro9500 media types named in the issue — the ids

Tests/ICCeryCoreTests/MediaQualityConstraintsTests.swift

@@ -194,6 +194,73 @@ final class MediaQualityConstraintsTests: XCTestCase {
         XCTAssertNil(map["13"])
     }
 
+    // MARK: - #218 tray-aware quality constraints
+
+    /// A conditional rule keyed by the selected tray/token must use the
+    /// supplied override rather than the queue's lpoptions default.
+    func testResolveWithTrayOverride() {
+        let dat = """
+            *EPIJUIConstraint: *EPIJ_FdSo 3 *EPIJ_Medi 0|*EPIJ_Qual 305
+            *EPIJUIConstraint: *EPIJ_FdSo 12 *EPIJ_Medi 0|*EPIJ_Qual 307
+            """
+        // The queue default is EPIJ_FdSo=2 (from `epsonListings`), so
+        // the default map has no forbidden qualities for media "0".
+        let defaultMap = MediaQualityConstraints.resolve(
+            listings: epsonListings, ppd: nil)
+        XCTAssertNil(defaultMap["0"])
+
+        // Override to tray "3" -> 305 forbidden; override to tray "12"
+        // -> 307 forbidden.
+        let ppd = """
+            *EPIJDriverBasePath: "/drivers/epson"
+            *EPIJMachineBundleName: "EP14C0605W.data"
+            """
+        let datURL = URL(fileURLWithPath:
+            "/drivers/epson/Machine/EP14C0605W.data/"
+                + "Contents/Resources/PDEData.dat")
+        let readFile: (URL) -> Data? = {
+            $0 == datURL ? dat.data(using: .utf8) : nil
+        }
+        let tray3 = MediaQualityConstraints.resolve(
+            listings: epsonListings, ppd: ppd,
+            optionOverrides: ["EPIJ_FdSo": "3"], readFile: readFile)
+        XCTAssertEqual(tray3["0"], epsonQualityIDs.subtracting(["305"]))
+
+        let tray12 = MediaQualityConstraints.resolve(
+            listings: epsonListings, ppd: ppd,
+            optionOverrides: ["EPIJ_FdSo": "12"], readFile: readFile)
+        XCTAssertEqual(tray12["0"], epsonQualityIDs.subtracting(["307"]))
+    }
+
+    func testResolveTrayOverrideCacheReadOnlyOnce() {
+        let dat = """
+            *EPIJUIConstraint: *EPIJ_FdSo 3 *EPIJ_Medi 0|*EPIJ_Qual 305
+            """
+        let ppd = """
+            *EPIJDriverBasePath: "/drivers/epson"
+            *EPIJMachineBundleName: "EP14C0605W.data"
+            """
+        let datURL = URL(fileURLWithPath:
+            "/drivers/epson/Machine/EP14C0605W.data/"
+                + "Contents/Resources/PDEData.dat")
+        var reads = 0
+        var cache: [URL: Data] = [:]
+        let readFile: (URL) -> Data? = {
+            if let cached = cache[$0] { return cached }
+            reads += 1
+            let data = $0 == datURL ? dat.data(using: .utf8) : nil
+            cache[$0] = data
+            return data
+        }
+        _ = MediaQualityConstraints.resolve(
+            listings: epsonListings, ppd: ppd,
+            optionOverrides: ["EPIJ_FdSo": "3"], readFile: readFile)
+        _ = MediaQualityConstraints.resolve(
+            listings: epsonListings, ppd: ppd,
+            optionOverrides: ["EPIJ_FdSo": "12"], readFile: readFile)
+        XCTAssertEqual(reads, 1)
+    }
+
     // MARK: - Canon cnb table
 
     /// Builds one 20-byte Canon record: `30 00 01 00 00 00 00 00`,
@@ -308,4 +375,38 @@ final class MediaQualityConstraintsTests: XCTestCase {
         XCTAssertEqual(caps.qualities(forMediaType: "99").count, 7)
         XCTAssertTrue(caps.allowsQuality("305", forMediaType: nil))
     }
+
+    func testTraySpecificQualityMap() {
+        var caps = PrinterCapabilities(
+            mediaTypes: [
+                PrinterMediaType(id: "0", name: "Plain"),
+            ],
+            qualities: ["301", "302", "303", "304", "305"]
+                .map { PrinterQuality(id: $0, name: "Q\($0)") },
+            qualityIDsByMediaType: ["0": ["301", "302", "303"]])
+        caps.qualityIDsByMediaTypeByTray = [
+            "Rear": ["0": ["301", "302", "303"]],
+            "Front": ["0": ["303", "304", "305"]],
+        ]
+
+        XCTAssertEqual(
+            caps.qualities(forMediaType: "0", trayToken: "Rear")
+                .map { $0.id }, ["301", "302", "303"])
+        XCTAssertEqual(
+            caps.qualities(forMediaType: "0", trayToken: "Front")
+                .map { $0.id }, ["303", "304", "305"])
+        // Unknown tray falls back to the default map.
+        XCTAssertEqual(
+            caps.qualities(forMediaType: "0", trayToken: "Unknown")
+                .map { $0.id }, ["301", "302", "303"])
+        // No tray token also falls back.
+        XCTAssertEqual(
+            caps.qualities(forMediaType: "0").map { $0.id },
+            ["301", "302", "303"])
+
+        XCTAssertTrue(caps.allowsQuality(
+            "304", forMediaType: "0", trayToken: "Front"))
+        XCTAssertFalse(caps.allowsQuality(
+            "304", forMediaType: "0", trayToken: "Rear"))
+    }
 }

Tests/ICCeryCoreTests/PrintPanelTests.swift

@@ -44,10 +44,16 @@ final class PrintPanelStubTests: XCTestCase {
             "ICCERY_TEST_PANEL_OPTIONS": "MediaType=Photo InputSlot=Rear",
             "ICCERY_TEST_PANEL_PRINTER": "Other_Queue",
         ]) {
-            let result = UITestHooks.printPanelResult(forQueue: "q")
+            let trays = [
+                PrinterTray(id: 1, token: "Auto", name: "Auto"),
+                PrinterTray(id: 2, token: "Rear", name: "Rear"),
+            ]
+            let result = UITestHooks.printPanelResult(
+                forQueue: "q", trays: trays, preferredTrayKey: "InputSlot")
             XCTAssertEqual(result?.selectedPrinter, "Other_Queue")
             XCTAssertEqual(result?.options.cupsOptions, "MediaType=Photo InputSlot=Rear")
             XCTAssertEqual(result?.options.mediaType, "Photo")
+            XCTAssertEqual(result?.options.paperSource, 2)
             XCTAssertEqual(result?.options.ppdUncorrectedPassthrough, true)
         }
     }
@@ -99,4 +105,60 @@ final class PrintPanelStubTests: XCTestCase {
             XCTAssertNil(result?.options.cupsOptions)
         }
     }
+
+    /// #218 — vendor tray keys and the `AP_D_InputSlot` capture alias
+    /// map back through `paperSource` when the token matches the roster.
+    func testOkResultExtractsTrayToken() throws {
+        let trays = [
+            PrinterTray(id: 1, token: "Auto", name: "Auto"),
+            PrinterTray(id: 2, token: "Rear", name: "Rear Tray"),
+            PrinterTray(id: 3, token: "Manual", name: "Manual Feed"),
+        ]
+        try withEnv([
+            "ICCERY_UI_TESTING": "1",
+            "ICCERY_TEST_PRINT_PANEL": "ok",
+            "ICCERY_TEST_PANEL_OPTIONS": "PageSize=A4 EPIJ_FdSo=Rear",
+            "ICCERY_TEST_PANEL_PRINTER": nil,
+        ]) {
+            let result = UITestHooks.printPanelResult(
+                forQueue: "q", trays: trays,
+                preferredTrayKey: "EPIJ_FdSo")
+            XCTAssertEqual(result?.options.paperSource, 2)
+            XCTAssertEqual(result?.options.cupsOptions,
+                           "PageSize=A4 EPIJ_FdSo=Rear")
+        }
+    }
+
+    func testOkResultExtractsAPDInputSlotAlias() throws {
+        let trays = [
+            PrinterTray(id: 1, token: "Auto", name: "Auto"),
+            PrinterTray(id: 2, token: "Manual", name: "Manual Feed"),
+        ]
+        try withEnv([
+            "ICCERY_UI_TESTING": "1",
+            "ICCERY_TEST_PRINT_PANEL": "ok",
+            "ICCERY_TEST_PANEL_OPTIONS": "AP_D_InputSlot=Manual",
+            "ICCERY_TEST_PANEL_PRINTER": nil,
+        ]) {
+            let result = UITestHooks.printPanelResult(
+                forQueue: "q", trays: trays)
+            XCTAssertEqual(result?.options.paperSource, 2)
+        }
+    }
+
+    func testOkResultUnknownTrayNoPaperSource() throws {
+        let trays = [
+            PrinterTray(id: 1, token: "Auto", name: "Auto"),
+        ]
+        try withEnv([
+            "ICCERY_UI_TESTING": "1",
+            "ICCERY_TEST_PRINT_PANEL": "ok",
+            "ICCERY_TEST_PANEL_OPTIONS": "InputSlot=Unknown",
+            "ICCERY_TEST_PANEL_PRINTER": nil,
+        ]) {
+            let result = UITestHooks.printPanelResult(
+                forQueue: "q", trays: trays)
+            XCTAssertNil(result?.options.paperSource)
+        }
+    }
 }

Tests/ICCeryCoreTests/PrintPanelTicketTests.swift

@@ -0,0 +1,180 @@
+import AppKit
+import Foundation
+import XCTest
+@testable import ICCery
+@testable import ICCeryCore
+
+/// Issue #217 — the panel's pre-modal seam
+/// (`PrintPanelService.configureBoundPanel`) must rehydrate the
+/// captured `PrintTicket` before the Stage 2 writes, validate the
+/// result, and refuse a foreign-queue ticket — all without driving
+/// the modal or needing a real queue (`printer: nil` exercises
+/// restore → selections → validate on a session-less `NSPrintInfo`).
+@MainActor
+final class PrintPanelTicketTests: XCTestCase {
+
+    private let service = PrintPanelService()
+
+    /// The queue a destination `NSPrintInfo` will report as bound —
+    /// the session's current printer, else a synthetic token for a
+    /// queue-less environment (same convention as PrintTicketTests).
+    private func boundQueue(of printInfo: NSPrintInfo) -> String {
+        PMTicketBridge.currentPrinterID(
+            session: PMTicketBridge.session(printInfo),
+            fallback: "UnboundQueue")
+    }
+
+    private func makeTicket(
+        queue: String,
+        key: String = "EPIJ_Qual",
+        value: String = "305"
+    ) throws -> PrintTicket {
+        let source = NSPrintInfo()
+        XCTAssertTrue(
+            PMTicketBridge.setValue(
+                value, forKey: key, locked: false,
+                in: PMTicketBridge.settings(source),
+                context: "PrintPanelTicketTests"))
+        return try PMTicketBridge.serialise(source, queue: queue)
+    }
+
+    private func request(
+        ticket: PrintTicket?,
+        selections: PrintPanelInitialSelections =
+            PrintPanelInitialSelections(),
+        trays: [PrinterTray] = []
+    ) -> PrintPanelRequest {
+        PrintPanelRequest(
+            queue: "Panel_Q", displayName: nil, optionKeys: [],
+            initialSelections: selections, ticket: ticket, trays: trays)
+    }
+
+    /// RC1 — a captured vendor key is present in the configured
+    /// printInfo before the modal would open.
+    func testTicketRestoredPreModal() throws {
+        let printInfo = NSPrintInfo()
+        let ticket = try makeTicket(queue: boundQueue(of: printInfo))
+
+        service.configureBoundPanel(
+            printInfo, request: request(ticket: ticket), printer: nil)
+
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(
+                forKey: "EPIJ_Qual",
+                in: PMTicketBridge.settings(printInfo)),
+            "305")
+    }
+
+    /// D6 parity — Stage 2 selections win over the restored ticket.
+    func testStage2WinsOverTicket() throws {
+        let printInfo = NSPrintInfo()
+        let ticket = try makeTicket(queue: boundQueue(of: printInfo))
+        var selections = PrintPanelInitialSelections()
+        selections.qualityKey = "EPIJ_Qual"
+        selections.quality = "303"
+
+        service.configureBoundPanel(
+            printInfo,
+            request: request(ticket: ticket, selections: selections),
+            printer: nil)
+
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(
+                forKey: "EPIJ_Qual",
+                in: PMTicketBridge.settings(printInfo)),
+            "303")
+    }
+
+    /// R3 — a ticket captured for another queue is refused; the
+    /// destination's settings stay untouched and nothing throws.
+    func testCrossQueueTicketRefusedAtPanel() throws {
+        let printInfo = NSPrintInfo()
+        let bound = boundQueue(of: printInfo)
+        let foreign = "DefinitelyNot_\(bound)"
+        try XCTSkipIf(
+            bound == foreign,
+            "destination resolved to the foreign queue")
+        XCTAssertTrue(
+            PMTicketBridge.setValue(
+                "999", forKey: "EPIJ_Qual", locked: false,
+                in: PMTicketBridge.settings(printInfo),
+                context: "PrintPanelTicketTests"))
+        let ticket = try makeTicket(queue: foreign)
+
+        service.configureBoundPanel(
+            printInfo, request: request(ticket: ticket), printer: nil)
+
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(
+                forKey: "EPIJ_Qual",
+                in: PMTicketBridge.settings(printInfo)),
+            "999")
+    }
+
+    /// #218 — the Stage 2 tray selection lands after `PageSize` and
+    /// before the media key in the configured `NSPrintInfo`.
+    func testStage2TrayWrittenPreModal() {
+        let printInfo = NSPrintInfo()
+        var selections = PrintPanelInitialSelections()
+        selections.paperSize = "A4"
+        selections.trayKey = "EPIJ_FdSo"
+        selections.tray = "Rear"
+        selections.mediaType = "Photo"
+
+        var req = request(ticket: nil, selections: selections)
+        req = PrintPanelRequest(
+            queue: req.queue, displayName: req.displayName,
+            optionKeys: ["MediaType"], initialSelections: selections,
+            ticket: nil, trays: [])
+        service.configureBoundPanel(
+            printInfo, request: req, printer: nil)
+
+        let settings = PMTicketBridge.settings(printInfo)
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(forKey: "PageSize", in: settings),
+            "A4")
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(forKey: "EPIJ_FdSo", in: settings),
+            "Rear")
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(
+                forKey: "MediaType", in: settings), "Photo")
+    }
+
+    /// First-ever open — no ticket, selections still land and the
+    /// post-selections validate keeps them readable.
+    func testNoTicketKeepsSelections() {
+        let printInfo = NSPrintInfo()
+        var selections = PrintPanelInitialSelections()
+        selections.paperSize = "A4"
+        selections.qualityKey = "EPIJ_Qual"
+        selections.quality = "303"
+        selections.orientation = "landscape"
+
+        service.configureBoundPanel(
+            printInfo,
+            request: request(ticket: nil, selections: selections),
+            printer: nil)
+
+        let settings = PMTicketBridge.settings(printInfo)
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(
+                forKey: "PageSize", in: settings), "A4")
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(
+                forKey: "EPIJ_Qual", in: settings), "303")
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(
+                forKey: "orientation-requested", in: settings), "4")
+        // The suppression writes still land on the ticket so the PDE
+        // sees the locked AP_* pair (③) and Quartz vocabulary (⑤′).
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(
+                forKey: "AP_ColorMatchingMode", in: settings),
+            "AP_ApplicationColorMatching")
+        XCTAssertEqual(
+            PMTicketBridge.stringValue(
+                forKey: "PMColorMatchingMode", in: settings),
+            "APCustomColorMatching")
+    }
+}

Tests/ICCeryCoreTests/PrintSessionViewModelTests.swift

@@ -50,7 +50,7 @@ final class PrintSessionViewModelTests: XCTestCase {
             done
             if [ "$list" = "1" ]; then
               printf 'PageSize/Media Size: 4x6 5x7 *A4 Letter Legal Custom.WIDTHxHEIGHT\\n'
-              printf 'InputSlot/Media Source: Auto *Main Rear\\n'
+              printf 'InputSlot/Media Source: Auto Main *Rear\\n'
               printf 'MediaType/Media Type: *Stationery Glossy Matte\\n'
               printf 'EPIJ_Qual/Print Quality: 301 302 *303 308 304 305 307\\n'
               exit 0
@@ -99,6 +99,10 @@ final class PrintSessionViewModelTests: XCTestCase {
 
         XCTAssertEqual(workflow.pageSize, .a4)
         XCTAssertEqual(workflow.print.selectedPaperSize, 3)
+        // Tray seeds from the `*` default on caps load, not the first
+        // list element (#218).
+        XCTAssertEqual(workflow.print.selectedTray, 3)
+        XCTAssertEqual(workflow.print.selectedTrayToken, "Rear")
         // Quality seeds from the `*` default on caps load.
         XCTAssertEqual(workflow.print.selectedQuality, "303")
         // All seven Epson codes enumerate in driver order (#180).
@@ -209,6 +213,7 @@ final class PrintSessionViewModelTests: XCTestCase {
         let log = await waitForFile(spoolLogURL)
         XCTAssertTrue(log.contains("PageSize=Letter"), log)
         XCTAssertTrue(log.contains("EPIJ_Qual=301"), log)
+        XCTAssertTrue(log.contains("InputSlot=Rear"), log)
     }
 
     /// #201 — the stubbed panel never produces a `PrintTicket`, so a
@@ -241,6 +246,7 @@ final class PrintSessionViewModelTests: XCTestCase {
         XCTAssertTrue(log.contains("PageSize=A4"), log)
         XCTAssertTrue(log.contains("EPIJ_Qual=303"), log)
         XCTAssertTrue(log.contains("MediaType=Stationery"), log)
+        XCTAssertTrue(log.contains("InputSlot=Rear"), log)
         XCTAssertTrue(log.contains("orientation-requested=3"), log)
         XCTAssertTrue(log.contains(
             "AP_ColorMatchingMode=AP_ApplicationColorMatching"), log)
@@ -307,6 +313,52 @@ final class PrintSessionViewModelTests: XCTestCase {
         XCTAssertEqual(workflow.pageSize, .a4)
     }
 
+    /// #218 — a captured `InputSlot=` (or any roster key) maps back to
+    /// `selectedTray` and populates `PrintOptions.paperSource`.
+    func testPanelResultAppliesBackTray() async throws {
+        setenv("ICCERY_UI_TESTING", "1", 1)
+        setenv("ICCERY_TEST_PRINT_PANEL", "ok", 1)
+        setenv("ICCERY_TEST_PANEL_OPTIONS", "InputSlot=Auto", 1)
+        defer {
+            unsetenv("ICCERY_UI_TESTING")
+            unsetenv("ICCERY_TEST_PRINT_PANEL")
+            unsetenv("ICCERY_TEST_PANEL_OPTIONS")
+        }
+
+        let workflow = makeWorkflow()
+        workflow.pageSize = .a4
+        await loadCaps(workflow.print)
+        XCTAssertEqual(workflow.print.selectedTray, 3)
+
+        workflow.print.openPrinterPreferences()
+        await waitForNotice(workflow.print, containing: "Settings captured")
+        XCTAssertEqual(workflow.print.selectedTray, 1)
+    }
+
+    /// #218 — a captured tray token absent from the roster is appended
+    /// as a synthetic entry and selected.
+    func testPanelResultUnknownTrayAppended() async throws {
+        setenv("ICCERY_UI_TESTING", "1", 1)
+        setenv("ICCERY_TEST_PRINT_PANEL", "ok", 1)
+        setenv("ICCERY_TEST_PANEL_OPTIONS", "InputSlot=OnlyInDialog", 1)
+        defer {
+            unsetenv("ICCERY_UI_TESTING")
+            unsetenv("ICCERY_TEST_PRINT_PANEL")
+            unsetenv("ICCERY_TEST_PANEL_OPTIONS")
+        }
+
+        let workflow = makeWorkflow()
+        workflow.pageSize = .a4
+        await loadCaps(workflow.print)
+        let originalCount = workflow.print.printerCaps.trays.count
+
+        workflow.print.openPrinterPreferences()
+        await waitForNotice(workflow.print, containing: "Settings captured")
+        XCTAssertEqual(workflow.print.printerCaps.trays.count,
+                       originalCount + 1)
+        XCTAssertEqual(workflow.print.selectedTrayToken, "OnlyInDialog")
+    }
+
     /// #186 — a captured `PageSize` token with no capability match
     /// leaves `selectedPaperSize` unchanged (never a guessed id).
     func testPanelResultUnknownPaperLeavesSelection() async throws {
@@ -456,6 +508,35 @@ final class PrintSessionViewModelTests: XCTestCase {
         XCTAssertEqual(workflow.print.selectedQuality, "303")
     }
 
+    /// #218 — a per-tray quality map is selected when the current tray
+    /// token has an entry; otherwise it falls back to the default map.
+    func testTraySpecificQualityMapSelected() async {
+        let workflow = makeWorkflow()
+        await loadCaps(workflow.print)
+        var caps = workflow.print.printerCaps
+        caps.qualityIDsByMediaType = [
+            "Stationery": ["301", "302", "303"],
+            "Glossy": ["305", "307"],
+        ]
+        caps.qualityIDsByMediaTypeByTray = [
+            "Auto": ["Stationery": ["301", "302"]],
+            "Rear": ["Stationery": ["301", "302", "303", "304"]],
+        ]
+        workflow.print.printerCaps = caps
+        XCTAssertEqual(workflow.print.selectedTrayToken, "Rear")
+        // Non-empty tray map for Rear wins over the default media map.
+        XCTAssertEqual(workflow.print.availableQualities.map { $0.id },
+            ["301", "302", "303", "304"])
+
+        workflow.print.selectedTray = 1 // Auto
+        XCTAssertEqual(workflow.print.availableQualities.map { $0.id },
+            ["301", "302"])
+
+        workflow.print.selectedTray = 999 // invalid -> fallback
+        XCTAssertEqual(workflow.print.availableQualities.map { $0.id },
+            ["301", "302", "303"])
+    }
+
     /// Seeding lands inside the allowed set even when the driver
     /// default quality is invalid for the first media — end to end
     /// through `CupsService.capabilities(for:)` + a fixture

Tests/ICCeryCoreTests/TicketWriteResolverTests.swift

@@ -2,9 +2,9 @@ import XCTest
 @testable import ICCeryCore
 @testable import ICCery
 
-/// Issue #201 Phase 4 — the resolved ticket-write list that replaces
+/// Issue #201 Phase 4 / #218 — the resolved ticket-write list that
-/// the `lp` argv goldens: locked order 1–10, D6 (Stage 2 always
+/// replaces the `lp` argv goldens: locked order 1–11, D6 (Stage 2
-/// wins), `raw` can never appear.
+/// always wins), `raw` can never appear.
 final class TicketWriteResolverTests: XCTestCase {
 
     private func resolve(
@@ -63,6 +63,7 @@ final class TicketWriteResolverTests: XCTestCase {
                 overrides: TargetPrintOverrides(
                     paperSize: "raw", mediaType: "raw",
                     qualityKey: "raw", quality: "raw",
+                    trayKey: "raw", tray: "raw",
                     orientation: "raw"),
                 optionKeys: optionKeys)
             XCTAssertFalse(r.writes.contains {
@@ -144,8 +145,8 @@ final class TicketWriteResolverTests: XCTestCase {
         XCTAssertNil(value("orientation-requested", in: resolve()))
     }
 
-    /// A `nil` override emits no write for that key; quality needs
+    /// A `nil` override emits no write for that key; quality and tray
-    /// **both** the detected key and the value.
+    /// need **both** the detected key and the value.
     func testNilOverridesEmitNoWrite() {
         let r = resolve(optionKeys: ["MediaType", "EPIJ_Qual"])
         XCTAssertNil(value("PageSize", in: r))
@@ -168,14 +169,42 @@ final class TicketWriteResolverTests: XCTestCase {
             overrides: TargetPrintOverrides(paperSize: ""))
         XCTAssertNil(value("PageSize", in: emptyPaper))
         XCTAssertNil(emptyPaper.paperToken)
+
+        // Tray: key or value alone, or an empty value, emits no write.
+        let trayKeyOnly = resolve(
+            overrides: TargetPrintOverrides(trayKey: "EPIJ_FdSo"),
+            optionKeys: ["EPIJ_FdSo"])
+        XCTAssertNil(value("EPIJ_FdSo", in: trayKeyOnly))
+        let trayValueOnly = resolve(
+            overrides: TargetPrintOverrides(tray: "Rear"),
+            optionKeys: ["EPIJ_FdSo"])
+        XCTAssertNil(value("EPIJ_FdSo", in: trayValueOnly))
+        let emptyTray = resolve(
+            overrides: TargetPrintOverrides(trayKey: "EPIJ_FdSo", tray: ""),
+            optionKeys: ["EPIJ_FdSo"])
+        XCTAssertNil(value("EPIJ_FdSo", in: emptyTray))
     }
 
-    /// The write list equals the locked 1–10 order, exactly.
+    /// #218 paper source is emitted with its canonical key and the raw
+    /// token; the display label must never reach the ticket.
+    func testTrayWrite() {
+        let r = resolve(
+            overrides: TargetPrintOverrides(
+                trayKey: "EPIJ_FdSo", tray: "Rear"),
+            optionKeys: ["EPIJ_FdSo"])
+        XCTAssertEqual(value("EPIJ_FdSo", in: r), "Rear")
+        XCTAssertEqual(r.writes.first { $0.key == "EPIJ_FdSo" }?.locked,
+            false)
+        XCTAssertNil(value("InputSlot", in: r))
+    }
+
+    /// The write list equals the locked 1–11 order, exactly.
     func testLockedWriteOrder() {
         let r = resolve(
             overrides: TargetPrintOverrides(
                 paperSize: "A4", mediaType: "Photo",
                 qualityKey: "EPIJ_Qual", quality: "305",
+                trayKey: "EPIJ_FdSo", tray: "Rear",
                 orientation: "landscape"),
             optionKeys: ["MediaType", "EPIJ_Qual", "EPIJ_CMat"])
         XCTAssertEqual(keys(r), [
@@ -185,6 +214,7 @@ final class TicketWriteResolverTests: XCTestCase {
             "PMCustomColorMatchingProfile",
             "com.apple.print.PrintSettings.PMColorMatchingMode",
             "PageSize",
+            "EPIJ_FdSo",
             "MediaType",
             "EPIJ_Qual",
             "EPIJ_CMat",

Tests/ICCeryUITests/Fixtures/bin/lpoptions

@@ -15,7 +15,7 @@ for arg in "$@"; do
 done
 if [ "$list" = "1" ]; then
   printf 'PageSize/Media Size: 4x6 5x7 *A4 Letter Legal\n'
-  printf 'InputSlot/Media Source: Auto *Main Rear\n'
+  printf 'EPIJ_FdSo/Paper Source: Auto *Main Rear\n'
   printf 'MediaType/Media Type: *Stationery PhotographicGlossy PhotographicMatte\n'
   printf 'EPIJ_Qual/Print Quality: 301 302 *303 308 304 305 307\n'
   printf 'EPIJ_CMat/Color Adjust: *0 1 2 3\n'

Tests/ICCeryUITests/Milestone11PrintSettingsUITests.swift

@@ -124,8 +124,7 @@ final class Milestone11PrintSettingsUITests: XCTestCase {
         XCTAssertTrue(element("printerSelect").exists)
         XCTAssertTrue(element("printerTraySelect").exists)
         XCTAssertTrue(element("printerMediaTypeSelect").exists)
-        XCTAssertTrue(element("btnOrientPortrait").exists)
+        XCTAssertTrue(element("printerOrientationSelect").exists)
-        XCTAssertTrue(element("btnOrientLandscape").exists)
         XCTAssertTrue(element("btnPrinterProperties").exists)
     }
 

Tests/ICCeryUITests/Milestone3UITests.swift

@@ -114,18 +114,18 @@ final class Milestone3UITests: XCTestCase {
         return recordedSpoolLog()
     }
 
-    /// Drags `#galleryPage-0`'s TIFF upward so `identifier`'s button
+    /// Scrolls `stage-2` with the synthesized scroll wheel so
-    /// moves up, clear of the Dock collision zone at the window's
+    /// `identifier`'s button moves up, clear of the Dock collision
-    /// bottom edge (#132).
+    /// zone at the window's bottom edge (#132).
     ///
     /// macOS overlay scrollbars are not in the AX tree — never use
-    /// `app.scrollBars` — and a synthesized scroll wheel is inert on
+    /// `app.scrollBars` — and a click-drag does not scroll a macOS
-    /// this LazyVGrid, so the scroll is a real drag on the gallery
+    /// ScrollView (content-drag scrolling is iOS-only); the scroll
-    /// cell's content. A stale/off-screen AX frame resolves to a screen
+    /// wheel is the mechanism the platform supports (#215). A
-    /// point that can be a Dock icon — a coordinate click there once
+    /// stale/off-screen AX frame resolves to a screen point that can
-    /// opened Calendar instead of Print. Callers must click only when
+    /// be a Dock icon — a coordinate click there once opened Calendar
-    /// the returned element `isHittable`; never coordinate-click a
+    /// instead of Print. Callers must click only when the returned
-    /// stale frame.
+    /// element `isHittable`; never coordinate-click a stale frame.
     @discardableResult
     private func scrollStage2UntilHittable(
         _ identifier: String,
@@ -134,6 +134,8 @@ final class Milestone3UITests: XCTestCase {
         var button = app.buttons[identifier]
         let cell = app.descendants(matching: .any)["galleryPage-0"].firstMatch
         XCTAssertTrue(cell.waitForExistence(timeout: 10), "galleryPage-0")
+        let scrollView = app.scrollViews["stage-2"]
+        XCTAssertTrue(scrollView.waitForExistence(timeout: 10), "stage-2")
 
         let deadline = Date().addingTimeInterval(timeout)
         while Date() < deadline {
@@ -142,25 +144,12 @@ final class Milestone3UITests: XCTestCase {
                button.frame.maxY < windowBottom - 80 {
                 return button
             }
-            // Grab the upper half of the cell (the TIFF, not the Print
+            // Wheel-down inside the stage-2 viewport: content moves
-            // button / Dock) and drag toward the top of the window.
+            // UP ⇒ Print leaves the Dock zone. Negative deltaY scrolls
-            // Mouse moves UP ⇒ gallery content moves UP ⇒ Print leaves
+            // toward the document bottom (#215).
-            // the Dock zone.
-            if cell.isHittable {
-                let start = cell.coordinate(withNormalizedOffset:
-                    CGVector(dx: 0.5, dy: 0.25))
-                let end = start.withOffset(CGVector(dx: 0, dy: -280))
-                start.press(forDuration: 0.15, thenDragTo: end)
-            } else {
-                // Cell not hit-testable: drag the stage-2 content
-                // directly — still content, still never scrollBars.
-                let scrollView = app.scrollViews["stage-2"]
             scrollView.coordinate(withNormalizedOffset:
-                    CGVector(dx: 0.5, dy: 0.55))
+                CGVector(dx: 0.5, dy: 0.5))
-                    .press(forDuration: 0.15, thenDragTo:
+                .scroll(byDeltaX: 0, deltaY: -60)
-                        scrollView.coordinate(withNormalizedOffset:
-                            CGVector(dx: 0.5, dy: 0.15)))
-            }
             RunLoop.current.run(until: Date().addingTimeInterval(0.4))
             button = app.buttons[identifier]
         }
@@ -183,8 +172,7 @@ final class Milestone3UITests: XCTestCase {
             .waitForExistence(timeout: 10))
         XCTAssertTrue(element("printerTraySelect").exists)
         XCTAssertTrue(element("printerMediaTypeSelect").exists)
-        XCTAssertTrue(element("btnOrientPortrait").exists)
+        XCTAssertTrue(element("printerOrientationSelect").exists)
-        XCTAssertTrue(element("btnOrientLandscape").exists)
         XCTAssertTrue(app.buttons["btnPrintAll"].isEnabled)
     }
 
@@ -213,7 +201,7 @@ final class Milestone3UITests: XCTestCase {
     func testPanelSelectionsApplyBackToSpoolWrites() throws {
         app.launchEnvironment["ICCERY_TEST_PRINT_PANEL"] = "ok"
         app.launchEnvironment["ICCERY_TEST_PANEL_OPTIONS"] =
-            "InputSlot=Rear MediaType=PhotographicGlossy"
+            "EPIJ_FdSo=Rear MediaType=PhotographicGlossy"
         launchApp()
         reachPrintPanel()
         _ = waitFor("printerStatusBadge")
@@ -231,6 +219,7 @@ final class Milestone3UITests: XCTestCase {
         XCTAssertTrue(log.contains(
             "AP.ColorMatchingMode=AP_ApplicationColorMatching"), log)
         XCTAssertTrue(log.contains("MediaType=PhotographicGlossy"), log)
+        XCTAssertTrue(log.contains("EPIJ_FdSo=Rear"), log)
         // Detected bypass for the mock queue (EPIJ_CMat present in
         // lpoptions -l) is always written.
         XCTAssertTrue(log.contains("EPIJ_CMat=3"), log)

docs/10-print-system.md

@@ -43,8 +43,9 @@ AGENTS.md warns: adding fields requires updating **every** platform constructor
 
 | Field | Type | Meaning |
 |-------|------|---------|
-| `id` | `u16` | Windows: Win32 bin ID from `DC_BINS`. Unix: 1-based index of the `InputSlot` / `MediaSource` value (not a PPD code). |
+| `id` | `u16` | Windows: Win32 bin ID from `DC_BINS`. Unix/macOS: 1-based index of the detected tray listing. |
-| `name` | `String` | Windows: 24-WCHAR `DC_BINNAMES` string, or `"Tray {id}"` if empty. Unix: PPD choice with leading `*` stripped (e.g. `Auto`, `Upper`). |
+| `token` | `String` | **v2** (#218): the exact CUPS/PPD machine value (`Auto`, `Rear`, `1`, ...). |
+| `name` | `String` | Windows: 24-WCHAR `DC_BINNAMES` string, or `"Tray {id}"` if empty. Unix/macOS: PPD-enriched human label; if no PPD label is available, the raw token is used for display. |
 
 ### `PrinterPaperSize` (mod.rs:22–25)
 
@@ -78,7 +79,7 @@ AGENTS.md warns: adding fields requires updating **every** platform constructor
 
 | Field | Type | Windows | Linux | macOS |
 |-------|------|---------|-------|-------|
-| `paper_source` | `Option<u16>` | `dmDefaultSource` (tray id) | **ignored** (unix `build_lp_args` never emits `InputSlot`) | **ignored** unless present in captured `cups_options` |
+| `paper_source` | `Option<u16>` | `dmDefaultSource` (tray id) | **ignored** (unix `build_lp_args` never emits `InputSlot`) | v2 (#218): 1-based tray id driven by the Stage 2 picker; written to the detected tray key (`InputSlot`/`MediaSource`/`EPIJ_FdSo`/`EPIJ_PSrc`/`CNIJMediaSupply`) on the native ticket. |
 | `orientation` | `Option<String>` | `"landscape"` → `DMORIENT_LANDSCAPE` (2), else portrait (1) | `-o orientation-requested=4` (landscape) or `=3` (portrait) | same, skipped if `cups_options` already has the key |
 | `paper_size` | `Option<String>` | **ignored** | `-o PageSize=<value>` | same, skipped if `pagesize` already added |
 | `media_type` | `Option<String>` | parsed as `u32` → `dmMediaType` | `-o MediaType=<value>` (generic key only) | uses `detect_media_type_key` (`CNIJMediaType` / `EPIJ_Medi` / `StpMediaType` / `MediaType`); skipped if any of those keys already in `cups_options` |

docs/11-print-macos.md

@@ -236,7 +236,8 @@ After OK:
 4. Copy via `CStr`, `free(opts_ptr)`.
 5. `filter_cups_options_string` → `cups_options`.
 6. `extract_media_type_from_options` → `media_type`.
-7. Return `PrintPropertiesResult { selected_printer, options: PrintOptions { media_type, cups_options, ppd_uncorrected_passthrough: Some(true), ..Default } }`.
+7. `extract_tray_from_options` → the selected tray token and a 1-based `paper_source` id when it matches the roster.
+8. Return `PrintPropertiesResult { selected_printer, options: PrintOptions { media_type, cups_options, paper_source, ppd_uncorrected_passthrough: Some(true), ..Default } }`.
 
 Failure of `PMPrintSettingsToOptions` is a hard `Err`.
 
@@ -264,7 +265,7 @@ Captured from the panel into the Stage 2 mirror (v1 forwarded them to `lp`):
 
 ```
 Media:      MediaType, CNIJMediaType, EPIJ_Medi, StpMediaType
-Tray:       InputSlot, AP_D_InputSlot
+Tray:       InputSlot, MediaSource, AP_D_InputSlot, EPIJ_FdSo, EPIJ_PSrc, CNIJMediaSupply
 Size:       PageSize
 Color:      CNIJIntent2, CNIJIntent, EPIJ_CMat, EPIJ_CCor, EPIJ_OSColMat,
             ColorCorrection, StpColorCorrection, EpsonColorMode, ColorModel
@@ -306,8 +307,9 @@ S14 PMRelease the printer on every path (defer)
 
 `TicketWriteResolver` produces the resolved write list as a pure value, in a
 locked order: both `AP_*` keys (locked) → the three Quartz keys (⑤′) →
-`PageSize` → the detected media key → the detected quality key → the driver
+`PageSize` → the detected tray key → the detected media key → the detected
-colour bypass → `orientation-requested`. Stage 2 overrides **always win**
+quality key → the driver colour bypass → `orientation-requested`. Stage 2
+overrides **always win**
 over the rehydrated ticket (D6 — the v1 captured-wins inversion is gone);
 `raw` can never appear because there is no `lp`. Panels stay off
 (`showsPrintPanel` / `showsProgressPanel` false, `canSpawnSeparateThread`
@@ -407,7 +409,8 @@ AppKit: `NSPrintInfo`, `NSPrintPanel`, `NSPrinter::printerWithName`, `NSPrintPan
 ### PPD keys (detection)
 
 ```
-Media:   CNIJMediaType, EPIJ_Medi, StpMediaType, MediaType, MediaSource, InputSlot, PageSize, MediaSize
+Media:    CNIJMediaType, EPIJ_Medi, StpMediaType, MediaType, PageSize, MediaSize
+Tray:     InputSlot, MediaSource, EPIJ_FdSo, EPIJ_PSrc, CNIJMediaSupply  (EPIJ_FdSo preferred over EPIJ_PSrc when both present)
 Color:    CNIJIntent2, CNIJIntent, EPIJ_CCor, EPIJ_CMat, StpColorCorrection, ColorCorrection, EpsonColorMode
 ```
 

docs/24-issues-invariants.md

@@ -130,7 +130,7 @@ Grouped by subsystem. Issue numbers are always cited.
 
 **Sister-product traps (ICCery-CPU `#1`, `#2`, `#5`) that also apply to any CUPS rewrite:**
 - PPD `ChoiceName/TranslationString` — UI must show the title, send the code (`MediaType=13` not `MediaType=Epson Premium Glossy`).
-- Tray keywords are vendor-specific (`InputSlot` vs Epson `EPIJ_FdSo` vs Canon `CNIJMediaSupply`). Empty arrays are not `nil` — coalescing `?? ["Auto"]` does not fire.
+- Tray keywords are vendor-specific (`InputSlot`/`MediaSource` vs Epson `EPIJ_FdSo`/`EPIJ_PSrc` vs Canon `CNIJMediaSupply`). When both Epson keys are present, `EPIJ_FdSo` is the feed-source control and takes precedence over `EPIJ_PSrc`. Empty arrays are not `nil` — coalescing `?? ["Auto"]` does not fire.
 - Canon Super Fine is three coordinated keys (`CNIJPrintQuality=0`, `CNIJPrintMode2=5`, `CNIJPQualitySlider=5`), not `cupsPrintQuality=High`.
 
 ---

project.yml

@@ -61,7 +61,7 @@ targets:
         INFOPLIST_KEY_LSMinimumSystemVersion: "12.0"
         INFOPLIST_KEY_NSPrincipalClass: NSApplication
         INFOPLIST_KEY_NSHumanReadableCopyright: "Copyright © 2026 Gronod. AGPLv3."
-        MARKETING_VERSION: "2.0.2"
+        MARKETING_VERSION: "2.0.4"
         CURRENT_PROJECT_VERSION: "1"
         # Stamped by scripts/version.sh at packaging/CI time (release tag or
         # `git describe` string); About shows it next to the marketing version.

scripts/package-release.sh

@@ -150,7 +150,7 @@ if [ ! -f "$DMG_BACKGROUND" ]; then
 fi
 
 echo "==> Building DMG"
-VERSION="$(plutil -extract CFBundleShortVersionString raw "$APP/Contents/Info.plist" 2>/dev/null || printf '2.0.0')"
+VERSION="$(plutil -extract CFBundleShortVersionString raw "$APP/Contents/Info.plist" 2>/dev/null || printf '2.0.3')"
 BUILD_NUM="$(plutil -extract CFBundleVersion raw "$APP/Contents/Info.plist" 2>/dev/null || printf '1')"
 # Tagged/described builds carry the tag in the DMG name so prerelease
 # artefacts are self-describing (ICCery-2.0.0-pre2-grok-236.dmg); a plain