[jdk21u-dev] RFR: 8354219: Automate javax/swing/JComboBox/ComboPopupBug.java

[Goetz Lindenmaier]

I backport this for parity with 21.0.11-oracle.

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Commit messages:
 - Backport 223eec55018f1640cb292b11130e3e1d6451990d

Changes: https://git.openjdk.org/jdk21u-dev/pull/2590/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=2590&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354219
  Stats: 72 lines in 1 file changed: 29 ins; 14 del; 29 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/2590.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/2590/head:pull/2590

PR: https://git.openjdk.org/jdk21u-dev/pull/2590