restore rectangleOverlap

static/script.js

@@ -432,6 +432,13 @@ class Game {
 
 }
 
+function rectangleOverlap(rect1, rect2) {
+    return rect1.x < rect2.x + rect2.w &&
+        rect1.x + rect1.w > rect2.x &&
+        rect1.y < rect2.y + rect2.h &&
+        rect1.y + rect1.h > rect2.y;
+}
+
 const game = new Game({
     canvasId: 'canvas',
     chatInputId: 'msg',