Hide all windows when building anything on the map

src/tree_gui.cpp

@@ -147,6 +147,7 @@ public:
 	virtual void OnPlaceObject(Point pt, TileIndex tile)
 	{
 		VpStartPlaceSizing(tile, VPM_X_AND_Y, DDSP_PLANT_TREES);
+		MoveAllWindowsOffScreen();
 	}
 
 	virtual void OnPlaceDrag(ViewportPlaceMethod select_method, ViewportDragDropSelectionProcess select_proc, Point pt)
@@ -159,6 +160,7 @@ public:
 		if (pt.x != -1 && select_proc == DDSP_PLANT_TREES) {
 			DoCommandP(end_tile, this->tree_to_plant, start_tile,
 				CMD_PLANT_TREE | CMD_MSG(STR_ERROR_CAN_T_PLANT_TREE_HERE));
+			MoveAllHiddenWindowsBackToScreen();
 		}
 	}
 
@@ -173,6 +175,7 @@ public:
 
 	virtual void OnPlaceObjectAbort()
 	{
+		MoveAllHiddenWindowsBackToScreen();
 		this->RaiseButtons();
 
 		ResetObjectToPlace();