[jfx22u] RFR: 8322703: Intermittent crash in WebView in a JFXPanel from IME calls on macOS

[Kevin Rushforth]

Clean backport to jfx22u (for 22.0.1).

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Commit messages:
 - Backport 40809a3f84d5f9f91b265f455a95d045e5b4f692

Changes: https://git.openjdk.org/jfx22u/pull/8/files
 Webrev: https://webrevs.openjdk.org/?repo=jfx22u&pr=8&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8322703
  Stats: 62 lines in 1 file changed: 33 ins; 18 del; 11 mod
  Patch: https://git.openjdk.org/jfx22u/pull/8.diff
  Fetch: git fetch https://git.openjdk.org/jfx22u.git pull/8/head:pull/8

PR: https://git.openjdk.org/jfx22u/pull/8