[Lexical] Bug Fix: backspace bug when deleting nodes with canInsertTextAfter set to false

[dani-lp]

Description

On Android Chrome, due to changes on #5644, nodes with canInsertTextAfter set to false don't delete the last character when pressing backspace (e.g. MentionNode, KeywordNode; see #5364).

The PR avoids delegating deletion to the browser on those cases.

Closes #5364

Steps to recreate

1. On Android Chrome, goto https://playground.lexical.dev/
2. Type @ and mention someone, or write a Keyword (e.g. congrats)
3. Hit backspace to delete the mention/keyword
4. Bug: the last character is not deleted and the cursor moves back one position

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 4, 2024 5:19am
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 4, 2024 5:19am

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[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.02 KB (0%)
lexical - esm	28.85 KB (0%)
@lexical/rich-text - cjs	37.37 KB (0%)
@lexical/rich-text - esm	28.34 KB (0%)
@lexical/plain-text - cjs	36.03 KB (0%)
@lexical/plain-text - esm	25.6 KB (0%)
@lexical/react - cjs	39.27 KB (0%)
@lexical/react - esm	29.75 KB (0%)

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[StyleT]

LGTM but it would be awesome to have a test for this... At least unit one

[dani-lp]

LGTM but it would be awesome to have a test for this... At least unit one

I'm not familiar with testing Lexical and I haven't found any tests in the codebase that cover the onBeforeInput function, so I'm not sure how to test this. Could you please give me some pointers for this?