RFR: 8353007: Open some JComboBox bugs 2 [v3]

[Alisen Chung]

> Updating and opening some tests

Alisen Chung has updated the pull request incrementally with one additional commit since the last revision:

  update tests

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/24496/files
  - new: https://git.openjdk.org/jdk/pull/24496/files/97c86bb9..24f40ddf

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24496&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24496&range=01-02

  Stats: 34 lines in 4 files changed: 4 ins; 4 del; 26 mod
  Patch: https://git.openjdk.org/jdk/pull/24496.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24496/head:pull/24496

PR: https://git.openjdk.org/jdk/pull/24496