RFR: 8353488: Open some JComboBox bugs 3 [v2]

[Alisen Chung]

> Opening some JComboBox bugs

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

  add robot keyrelease

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Changes:
  - all: https://git.openjdk.org/jdk/pull/24767/files
  - new: https://git.openjdk.org/jdk/pull/24767/files/62b1bb59..68ba2ec0

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=24767&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=24767&range=00-01

  Stats: 7 lines in 1 file changed: 4 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/24767.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24767/head:pull/24767

PR: https://git.openjdk.org/jdk/pull/24767