[lexical][lexical-playground] Bug Fix: Allow setEditorState to work correctly inside of an update

[etrepum]

Description

LexicalEditor.setEditorState has a bunch of shared code with LexicalEditor.update such that it doesn't need to be issued from inside of an update. However, if it is issued inside of an update then it will cause an extra $commitPendingUpdates call after the state and selection are already read-only which will throw in some situations when node transforms are in use.

This fix ensures that setEditorState is working with a writable state and selection so that transforms can run, and skips the redundant $commitPendingUpdates call for the scenarios when it is being called from inside an existing update context (e.g. a dispatchCommand from the history plugin)

Closes #6843

Test plan

Before

autocomplete-undo.mov

After

autocomplete-undo-after.mov

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 28, 2024 7:44am
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 28, 2024 7:44am

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	30.92 KB (0%)
lexical - esm	30.83 KB (0%)
@lexical/rich-text - cjs	39.73 KB (0%)
@lexical/rich-text - esm	32.65 KB (0%)
@lexical/plain-text - cjs	38.32 KB (0%)
@lexical/plain-text - esm	29.93 KB (0%)
@lexical/react - cjs	41.46 KB (0%)
@lexical/react - esm	34 KB (0%)