RFR: 8366202: RichTextArea: wrong style used for typed text [v3]

[Ziad El Midaoui]

On Fri, 31 Oct 2025 20:38:46 GMT, Andy Goryachev <angorya at openjdk.org> wrote:

>> User feedback (see https://mail.openjdk.org/pipermail/openjfx-discuss/2025-August/000267.html ):
>> 
>> When typing text, in the middle of a sentence, to extend a word that's styled then the typed text is not being inserted using the styles of the preceding text.
>> 
>> Root cause: implementation bug.
>
> Andy Goryachev has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains three additional commits since the last revision:
> 
>  - Merge branch 'master' into 8366202.wrong
>  - review comments
>  - wrong style

The test works fine, I tried it in the RTA Demo and adding text in middle of sentence keeps the styles of the preceding text.

I noticed one thing is that when clicking at the end of a line of text (or anywhere in the middle) and then changing the color or style it changes the whole line style and color, shouldn't the new color and style be applied on the newly typed text only and not change the existing text color? 
This happens also on master so maybe it's not related to this issue directly
steps to reproduce :

1. Write "testing testing testing"
2. click somewhere on this text without selecting any text
3. change color
4. notice the whole text is changing color (normally it shouldn't change colors of the existing text only the newly typed text)

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PR Comment: https://git.openjdk.org/jfx/pull/1950#issuecomment-3480373566