[jdk11u-dev] RFR: 8272806: [macOS] "Apple AWT Internal Exception" when input method is changed

[Martin Doerr]

Clean backport of JDK-8272806.

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Commit messages:
 - Backport f681d6544ac2506cb72e45c1f9ed8dfbbde099f2

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/345/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=345&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272806
  Stats: 4 lines in 2 files changed: 1 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/345.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/345/head:pull/345

PR: https://git.openjdk.java.net/jdk11u-dev/pull/345