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

[lacroixdavid1]

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.

#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.

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Name	Status	Preview	Comments	Updated (UTC)
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[ivailop7]

This looks interesting, never stumbled upon this issue. For @Sahejkm @zurfyx and @potatowagon to comment,

[Sahejkm]

Formatting text in the middle of a segmented or token text node was splitting the node.

Not sure how other editors handle it in general, currently GDocs doesn't even allow partial selection of @mention node, would it be ok to assume partial selection as full selection from formatting point of view ? @zurfyx wdyt ?

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

@lacroixdavid1 could you help explain this scenario via a video recording ? Thanks!

[acywatson]

@lacroixdavid1 could you help explain this scenario via a video recording ? Thanks!

It's pretty easy to repro the issue on the playground by just inserting a mention, selecting it partially, and applying bold format.

[acywatson]

I think these are actually probably the correct semantics for token/segmented nodes. The whole point of these is that they are a single "unit" and are interacted with as such from a creation/deletion standpoint.

The only other way I could think to deal with this would be to treat the styled portion of the node as and additional segment, rather than splitting the node and removing the token/segmented characteristics entirely.

[acywatson]

I'm good with this, but would like a second pair of eyes given that core selection is particularly prone to cause widespread issues.

[lacroixdavid1]

Formatting range selection with a segmented or token node in the middle was not formatting the node. @lacroixdavid1 could you help explain this scenario via a video recording ? Thanks!

For the following example, the MentionNode was changed from segmented to token.

Before

After

[julienmouyal]

Any progress on this one? Seems like a great improvement. Thanks!

[ivailop7]

LGTM, @zurfyx to sign off as well

[lacroixdavid1]

Any chances of getting this one merged into 0.15.1? 🙏 pls

[zurfyx]

Thank you, this makes a lot of sense! This actually makes me realize that we should recheck if there's any other codepath that can potentially mangle a segmented node like this. Segmented nodes should only segment in one way, separators, you shouldn't be able to split a Mention node arbritrary (at least not via user-input).

[lacroixdavid1]

Thank you, guys. Lexical is very solid and has a bright future.