RFR: 8306121: Scene not rendered initially when changing scenes after fix for JDK-8296621 [v19]

[Thiago Milczarek Sayao]

> I replicated the fix on #1054 on Linux.
> 
> Also fixes [Monocle: Stage no longer gets focus after fix for JDK-8296621](https://bugs.openjdk.org/browse/JDK-8304734)

Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:

  Use _updateViewSize

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

Changes:
  - all: https://git.openjdk.org/jfx/pull/1110/files
  - new: https://git.openjdk.org/jfx/pull/1110/files/e569a9f8..0809f527

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1110&range=18
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1110&range=17-18

  Stats: 29 lines in 4 files changed: 18 ins; 8 del; 3 mod
  Patch: https://git.openjdk.org/jfx/pull/1110.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1110/head:pull/1110

PR: https://git.openjdk.org/jfx/pull/1110