re-cover copy-settings through single-building blueprints

src/ui/WorldRenderer.h

@@ -35,6 +35,16 @@ struct ActiveBeam
     QVector2D      targetOffset;
 };
 
+// How a placement ghost is colored. Normal shows the building type's own colors
+// (REQ-BLD-GHOST); the other two override them (REQ-BLD-PLACE-VALID,
+// REQ-UI-BLUEPRINT-TRANSFER).
+enum class GhostTint
+{
+    Normal,
+    Invalid,
+    Transfer
+};
+
 // Everything the renderer draws that the simulation does not know about: what the
 // player has selected, which build mode is active, and the other transient bits of
 // interaction state the view owns. Assembled fresh each frame and passed by
@@ -113,7 +123,7 @@ private:
                        bool centered);
     void drawBuildingGhost(QPainter& painter, const WorldCoordinates& coordinates,
                            BuildingType type, QPoint anchorTile, Rotation rotation,
-                           bool valid, bool showPortTargetGlyphs);
+                           GhostTint tint, bool showPortTargetGlyphs);
 
     // Loads the per-building world icons (REQ-UI-WORLD-ICON) from
     // <configDir>/../icons/buildings once at construction. Only the building