fix issue where building selection outline is hidden by other buildings drawn later

src/ui/GameWorldView.h

@@ -115,6 +115,7 @@ private:
 
     void drawTiles(QPainter& painter);
     void drawBuildings(QPainter& painter);
+    void drawSelectionHighlights(QPainter& painter);
     void drawStations(QPainter& painter);
     void drawBeltItems(QPainter& painter);
     void drawScrap(QPainter& painter);