[jdk13u-dev] RFR: 8244088: [Regression] Switch of Gnome theme ends up in deadlocked UI

[Yuri Nesterenko]

The issue exists and the fix works in GTK-3-based systems (e.g. Xfce).

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Commit messages:
 - Backport a7f46919ff43ede12ed977512a3b0d93bc4cbc76

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/197/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=197&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/jdk13u-dev/pull/197.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/197/head:pull/197

PR: https://git.openjdk.java.net/jdk13u-dev/pull/197