Bug: LexicalClipboard pasting over mention crashes Chrome

[danielbuechele]

Lexical version: 0.14.5

Steps To Reproduce

1. Open Lexical Playground in Chrome and add an @-mention
2. Copy some any text to your clipboard
3. Create a selection that starts at the beginning of the @-mention (it can end within, at the end or after the mention)
4. Now paste from clipboard

The current behavior

In most cases this crashes Chrome, in rare cases it only takes very long and produces a warning [Violation] 'paste' handler took 95275ms. This affects up-to-date Chrome on macOS and Windows. Safari on macOS is not affected.

In a case where Chrome wasn't entirely crashing I was able to take this performance trace (sorry, I only took a screenshot instead of exporting the trace)

[ivailop7]

I reproduced. Wow!

[thegreatercurve]

Closed by #5956