testPrinttargFixtureGalleryAndStubbedPrint asserted btnPrintAll
immediately after the gallery appeared, without ICCERY_CUPS_BIN_DIR.
Gitea Monterey has system queues; GitHub macos-14-arm64 does not, so
selectedPrinter stays empty and the button stays disabled (run
34867767434). Point M2 at Fixtures/bin like M3, and wait for enable.