[jdk15u-dev] RFR: 8244088: [Regression] Switch of Gnome theme ends up in deadlocked UI

[Yuri Nesterenko]

applicable seamlessly, all relevant tests do pass.

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Commit messages:
 - Backport a7f46919ff43ede12ed977512a3b0d93bc4cbc76

Changes: https://git.openjdk.java.net/jdk15u-dev/pull/43/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk15u-dev&pr=43&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8244088
  Stats: 5 lines in 3 files changed: 0 ins; 2 del; 3 mod
  Patch: https://git.openjdk.java.net/jdk15u-dev/pull/43.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk15u-dev pull/43/head:pull/43

PR: https://git.openjdk.java.net/jdk15u-dev/pull/43