Bug: `SKIP_DOM_SELECTION_TAG` doesn't work during state initialization

[levensta]

Lexical version: 0.44

Steps To Reproduce

1. Add init state to $initialEditorState property of root extension or editorState property of InitialConfig
2. Add $addUpdateTag(SKIP_DOM_SELECTION_TAG)
3. Open the editor app

Link to code example: https://codesandbox.io/p/sandbox/nodestate-in-export-html-forked-tlqrkq
⚠️ Be sure to open the iframe with the application in a separate tab

The current behavior

The application initializes and scrolls to the end of the content

The expected behavior

Scrolling does not occur if the SKIP_DOM_SELECTION_TAG tag is added during the first update, i.e. initialization

Impact of fix

It's already known that $insertNodes is the recommended method for inserting generated nodes into content, as it normalizes inline elements by wrapping them in paragraphs. This function inserts nodes by changing the selection, but adding SKIP_DOM_SELECTION_TAG doesn't change anything. If this is expected behavior and initialization isn't just a first update, it would be helpful to include in the documentation the caveat that tags don't affect behavior within initialization. It would also be helpful to include an example where content is initialized using $insertNodes and scrolling is avoided

[etrepum]

Did you try $setSelection(null)?

[levensta]

I tried it, it worked. I think it's enough to just mention it in the documentation

[etrepum]

I could see a justification either way (or maybe both), either to make sure the tag works for the initial mount or to simply document the workaround. No strong preference. In addition to putting some docs the tag it might make sense to also add some here https://lexical.dev/docs/concepts/selection#focus

[SabbirMMS]

🤔😒

[etrepum]

The reason this happens is because the update that runs $initialEditorState is fully reconciled synchronously (to null DOM, just EditorState) before setRootElement is called. Update tags are cleared after reconciliation, so there are no update tags set when setRootElement is called to reconcile the EditorState to a non-null DOM thus any tags set during $initialEditorState won't apply.