[jfx17u] RFR: 8271054: [REDO] Wrong stage gets focused after modal stage creation

[Johan Vos]

Clean backport of 8271054: [REDO] Wrong stage gets focused after modal stage creation
Reviewed-by: kcr, arapte

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Commit messages:
 - 8271054: [REDO] Wrong stage gets focused after modal stage creation

Changes: https://git.openjdk.org/jfx17u/pull/63/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=63&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8271054
  Stats: 23 lines in 2 files changed: 22 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx17u/pull/63.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u pull/63/head:pull/63

PR: https://git.openjdk.org/jfx17u/pull/63