[jfx17u] RFR: 8284654: Modal behavior returns to wrong stage

[Johan Vos]

clean backport of 8284654: Modal behavior returns to wrong stage
Reviewed-by: arapte, kcr

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Commit messages:
 - 8284654: Modal behavior returns to wrong stage

Changes: https://git.openjdk.org/jfx17u/pull/64/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=64&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8284654
  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jfx17u/pull/64.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u pull/64/head:pull/64

PR: https://git.openjdk.org/jfx17u/pull/64