[jdk11u-dev] RFR: 8300269: The selected item in an editable JComboBox with titled border is not visible in Aqua LAF

[Andrew Lu]

I backport this for parity with 11.0.23-oracle.

remain the "final".

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Commit messages:
 - Backport ef6200c727332796d2e1c8ae3bfa155cbaa72f4c
 - Backport ef6200c727332796d2e1c8ae3bfa155cbaa72f4c

Changes: https://git.openjdk.org/jdk11u-dev/pull/2349/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2349&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300269
  Stats: 184 lines in 2 files changed: 183 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2349.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2349/head:pull/2349

PR: https://git.openjdk.org/jdk11u-dev/pull/2349