Bug: Long text tokens cause the editor to collapse

[moy2010]

Long text tokens can bring down the editor. This is easy to reproduce in the playground, just paste this: SomeVeryLongTextStartsToLagALot. Or you can type it and you'll see how performance starts degrading until the editor becomes unresponsive.

I'm suspicious of Regex-related plugins such as @lexical/markdown and AutoLinkPlugin, but haven't digged deeper. So far I've only narrowed the issue down to the smallest reproducible example after a few hours of debugging.

Lexical version: Tested in both 0.12.4 and 0.12.2. The issue is present in both versions.

It's also worth mentioning that I discovered the issue after opening a text that I created in june this year, so whatever is causing this issue should be part of a very recent version.

Steps To Reproduce

1. Type a very long text token (i.e. with no white spaces)
   2.Profit

The current behavior

The editor becomes unresponsive.

The expected behavior

The editor should handle long text tokens.

[ivailop7]

I replicate the slowness. It's either the insertNodes rewrite or indeed a regex somewhere :/ it's indeed a commit in the past 3 months.

[moy2010]

@ivailop7, I'm playing with the playground right now and I can reproduce it in the plain-text playground. As for the insertNodes rewrite, I don't think that's the issue since I could replicate it on the version 0.12.2.

[ivailop7]

Can you try the preview in this PR #5201 , I think this PR restores the performance back.

[moy2010]

That PR indeed fixes the slowness. Let's wait until it gets merged then 😃 .