[jdk21u-dev] RFR: 8342073: Call to insertText with single character from custom Input Method ignored

[Steven Loomis]

- Backport of JDK-8195675
- Backport of https://github.com/openjdk/jdk/commit/b8f2ec9091f9f7e5f4611991d04dd8aa113b94fd https://github.com/openjdk/jdk/pull/17921

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Commit messages:
 - 8342073: Call to insertText with single character from custom Input Method ignored

Changes: https://git.openjdk.org/jdk21u-dev/pull/1052/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=1052&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8342073
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/1052.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/1052/head:pull/1052

PR: https://git.openjdk.org/jdk21u-dev/pull/1052