fixed issue with "empty" elements [walls, stairs, elevators] during tool selection

minor ui changes

mapview/2D/MV2DElementFloorOutlinePolygon.h

@@ -48,6 +48,7 @@ public:
 	void paint(Painter& p) override {
 
 		QBrush brush;
+		QPen pen;
 
 		// fill-style (depends on the mode)
 		switch (fo.method) {
@@ -65,8 +66,14 @@ public:
 			brush.setColor(QColor(255,0,0));
 		}
 
+		if (hasFocus()) {
+			brush.setStyle(Qt::BrushStyle::FDiagPattern);
+		}
+
 		// outline + filled area
-		p.setPenBrush(Qt::black, brush);
+		pen.setColor(Qt::black);
+		pen.setWidth( hasFocus() ? 2 : 1 );
+		p.setPenBrush(pen, brush);
 		p.drawPolygon(fo.poly.points);
 
 		// selected endpoints?