[lexical-selection] Bug Fix / Fixes text formatting with segmented and token nodes #6059

[local-dev-korbit-ai-mentor]

Description

It is currently only possible to format token nodes by selecting them entirely. They won't be formatted if they are in the middle of the range selection. Also, if the selection offset is in the middle of the node, it will split the node.

This PR ensures middle nodes are formated, just like when selecting them entirely. Also, it prevents breaking segmented or token nodes in the middle of the text where they shouldn't be allowed.

facebook/lexical#6059

Test plan

Added unit tests to the PR. See LexicalSelection.test.tsx.

Before

• Formatting text in the middle of a segmented or token text node was splitting the node.
• Formatting range selection with a segmented or token node in the middle was not formatting the node.

After

• Formatting text in the middle of a segmented or token text node is not splitting the node anymore. It is formatting the whole node.
• Formatting range selection with a segmented or token node in the middle now formats the node.

Description by Korbit AI

What change is being made?

Fixes text formatting issues with segmented and token nodes in the LexicalSelection module by updating the formatting logic and adding new test cases.

Why are these changes being made?

The previous implementation did not correctly handle formatting for segmented and token nodes, leading to inconsistent text formatting. The new logic ensures that these nodes are properly formatted, and the added test cases verify the correctness of these changes.

[local-dev-korbit-ai-mentor]

Clone of the PR facebook/lexical#6062

[korbit-ai]

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[korbit-ai]

I have reviewed your code and did not find any issues!

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