fix: React 19 strict mode drag and drop bug #8562
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devongovett
commented
Jul 16, 2025
| @@ -240,9 +241,11 @@ export function useDrag(options: DragOptions): DragResult { | |||
| // If the dragged element is removed from the DOM via onDrop, onDragEnd won't fire: https://bugzilla.mozilla.org/show_bug.cgi?id=460801 | |||
| // In this case, we need to manually call onDragEnd on cleanup | |||
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| useLayoutEffect(() => { | |||
| useEffect(() => { | |||
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Switched to useEffect because layout effect cleanups happen before the element is actually removed.
snowystinger
previously approved these changes
Jul 16, 2025
|
looks like a react 16 test is failing though |
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Build successful! 🎉 |
reidbarber
approved these changes
Jul 17, 2025
LFDanLu
approved these changes
Jul 17, 2025
yihuiliao
approved these changes
Jul 17, 2025
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Closes #8548
Due to facebook/react#29585, React sometimes triggers extra effect cleanups when elements are reordered. This can occur during virtualized scrolling. When keyboard dragging and scrolling the dragged element out of view, the drop target would unexpectedly shift to another target. The layout effect caused the drag to be aborted and the global state to reset, resulting in our
isInternalchecks failing.This stores the actual dragged element in a ref instead of just a boolean. Then in the effect cleanup we check if the element has actually unmounted from the DOM. This will ignore false positives caused by strict mode where React calls the cleanup function even when not actually unmounting.