[jdk11u-dev] RFR: 8159597: [TEST_BUG] closed/javax/swing/JPopupMenu/4760494/bug4760494.java leaves key pressed

[Goetz Lindenmaier]

I downport this for parity with 11.0.134-oracle.

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Commit messages:
 - Backport 604005d65c5a3183b32bd13eabad4ddddf7c628f

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/464/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=464&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8159597
  Stats: 146 lines in 1 file changed: 146 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/464.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/464/head:pull/464

PR: https://git.openjdk.java.net/jdk11u-dev/pull/464