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

[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
- 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" />

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Commit messages:
 - Merge branch 'master' into 8371067.request.layout
 - test
 - request layout
 - test
 - fix

Changes: https://git.openjdk.org/jfx/pull/1975/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx&pr=1975&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8371067
  Stats: 87 lines in 4 files changed: 84 ins; 0 del; 3 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