RFR: 8352905: Open some JComboBox bugs 1 [v2]

[Alisen Chung]

> Updating and opening some tests

Alisen Chung has updated the pull request incrementally with two additional commits since the last revision:

 - update tests
 - update tests

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/24495/files
  - new: https://git.openjdk.org/jdk/pull/24495/files/6e4520de..57bb0878

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24495&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24495&range=00-01

  Stats: 147 lines in 4 files changed: 43 ins; 27 del; 77 mod
  Patch: https://git.openjdk.org/jdk/pull/24495.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24495/head:pull/24495

PR: https://git.openjdk.org/jdk/pull/24495