Codechange: Don't access SmallMapWindow method directly from LinkGraphOverlay.

src/linkgraph/linkgraph_gui.cpp

@@ -425,7 +425,7 @@ Point LinkGraphOverlay::GetStationMiddle(const Station *st) const
 		return GetViewportStationMiddle(this->window->viewport, st);
 	} else {
 		/* assume this is a smallmap */
-		return static_cast<const SmallMapWindow *>(this->window)->GetStationMiddle(st);
+		return GetSmallMapStationMiddle(this->window, st);
 	}
 }
 

src/smallmap_gui.cpp

@@ -1888,3 +1888,13 @@ bool ScrollMainWindowTo(int x, int y, int z, bool instant)
 
 	return res;
 }
+
+/**
+ * Determine the middle of a station in the smallmap window.
+ * @param st The station we're looking for.
+ * @return Middle point of the station in the smallmap window.
+ */
+Point GetSmallMapStationMiddle(const Window *w, const Station *st)
+{
+	return static_cast<const SmallMapWindow *>(w)->GetStationMiddle(st);
+}

src/smallmap_gui.h

@@ -212,4 +212,6 @@ public:
 	void OnMouseOver([[maybe_unused]] Point pt, int widget) override;
 };
 
+Point GetSmallMapStationMiddle(const Window *w, const Station *st);
+
 #endif /* SMALLMAP_GUI_H */