Fix too much recursion when using dynamically resized stage

src/scaffolding/scaffolding.js

@@ -324,9 +324,11 @@ class Scaffolding extends EventTarget {
     }
     // TODO: remove when https://github.com/TurboWarp/packager/issues/213 is fixed
     this.vm.on('STAGE_SIZE_CHANGED', (width, height) => {
-      this.width = width;
-      this.height = height;
-      this.relayout();
+      if (this.width !== width || this.height !== height) {
+        this.width = width;
+        this.height = height;
+        this.relayout();
+      }
     });
 
     this.cloudManager = new Cloud.CloudManager(this);