[jfx17u] RFR: 8221261: Deadlock on macOS in JFXPanel app when handling IME calls

[Johannes Bechberger]

Clean backport of 8221261: Deadlock on macOS in JFXPanel app when handling IME calls

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Commit messages:
 - 8221261: Deadlock on macOS in JFXPanel app when handling IME calls

Changes: https://git.openjdk.org/jfx17u/pull/178/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx17u&pr=178&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8221261
  Stats: 30 lines in 1 file changed: 28 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx17u/pull/178.diff
  Fetch: git fetch https://git.openjdk.org/jfx17u.git pull/178/head:pull/178

PR: https://git.openjdk.org/jfx17u/pull/178