dont appends mirror when mirror was removed

Author: zjffun

src/Plugins/ResizeMirror/ResizeMirror.js

@@ -126,6 +126,10 @@ export default class ResizeMirror extends AbstractPlugin {
    */
   [resize]({overContainer, over}) {
     requestAnimationFrame(() => {
+      if (!this.mirror.parentNode) {
+        return;
+      }
+
       if (this.mirror.parentNode !== overContainer) {
         overContainer.appendChild(this.mirror);
       }

src/Plugins/ResizeMirror/tests/ResizeMirror.test.js

@@ -7,6 +7,7 @@ import {
   waitForDragDelay,
   waitForPromisesToResolve,
   DRAG_DELAY,
+  drag,
 } from 'helper';
 import {Draggable} from '../../..';
 import ResizeMirror from '..';
@@ -129,6 +130,18 @@ describe('ResizeMirror', () => {
 
     releaseMouse(largerDraggable);
   });
+
+  it('dont appends mirror when mirror was removed', async () => {
+    drag({from: smallerDraggable, to: smallerDraggable});
+    drag({from: smallerDraggable, to: smallerDraggable});
+
+    await waitForPromisesToResolve();
+    waitForRequestAnimationFrame();
+
+    const mirror = document.querySelector('.draggable-mirror');
+
+    expect(mirror).toBeNull();
+  });
 });
 
 function mockDimensions(element, {width = 0, height = 0}) {