RFR: 8371067: RichTextArea: requestLayout by inline node doesn't reach VFlow [v3]

[Andy Goryachev]

> Requesting `VFlow` re-layout when signaled by a `Node` embedded in `TextCell`.
> 
> 
> ### NOTES
> 
> - this PR depends on https://github.com/openjdk/jfx/pull/1974 (resolved)
> - the fix can be verified visually using the latest Monkey Tester
> 
> <img width="1232" height="741" alt="Screenshot 2025-11-17 at 13 43 12" src="https://github.com/user-attachments/assets/58b2ef77-094c-45bd-8a04-3caaa4672df1" />

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 eight additional commits since the last revision:

 - updated test
 - Merge branch 'master' into 8371067.request.layout
 - add text segment
 - Merge branch 'master' into 8371067.request.layout
 - test
 - request layout
 - test
 - fix

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1975/files
  - new: https://git.openjdk.org/jfx/pull/1975/files/b714faff..ecd2c0e7

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1975&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1975&range=01-02

  Stats: 922 lines in 23 files changed: 749 ins; 70 del; 103 mod
  Patch: https://git.openjdk.org/jfx/pull/1975.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1975/head:pull/1975

PR: https://git.openjdk.org/jfx/pull/1975