render red border around overlay when DEBUG_LAYOUT pragma is set

lib/rippleoverlay.cpp

@@ -45,6 +45,16 @@ void RippleOverlay::paintEvent(QPaintEvent *event)
         painter.setOpacity(ripple->opacity());
         painter.drawEllipse(center, radius, radius);
     }
+
+#ifdef DEBUG_LAYOUT
+    QPen pen;
+    pen.setColor(Qt::red);
+    pen.setWidth(2);
+    painter.setOpacity(1);
+    painter.setPen(pen);
+    painter.setBrush(Qt::NoBrush);
+    painter.drawRect(rect());
+#endif
 }
 
 void RippleOverlay::deleteRipple()