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

[Andy Goryachev]

> 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

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1950/files
  - new: https://git.openjdk.org/jfx/pull/1950/files/aa17616f..643f97ef

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1950&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1950&range=01-02

  Stats: 816 lines in 16 files changed: 593 ins; 72 del; 151 mod
  Patch: https://git.openjdk.org/jfx/pull/1950.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1950/head:pull/1950

PR: https://git.openjdk.org/jfx/pull/1950