Drag events are called repeatedly under multiple instances

[xingzhoutantan]

When I open multiple pages in a project, the drag and drop events on each page are repeated.

[jack-michaud]

I see this too. A quick fix is to check if dropResult.addedIndex is null in your onDrop handler.

onDrop: (dropResult) => {
  if (dropResult.addedIndex == null)  return;
  // Do action
}