[jdk17u-dev] RFR: 8354466: Open some misc Swing bugs 9

[Satyen Subramaniam]

Backporting JDK-8354466: Open some misc Swing bugs 9. Adds a JSplitPane and JPasswordField test. Ran GHA Sanity Checks and new tests directly. Patch is clean. Backporting for parity with Oracle.

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

Commit messages:
 - Backport da16c839735bbf79ece4967f95a98208f74b7f73

Changes: https://git.openjdk.org/jdk17u-dev/pull/4119/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=4119&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8354466
  Stats: 180 lines in 2 files changed: 180 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/4119.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/4119/head:pull/4119

PR: https://git.openjdk.org/jdk17u-dev/pull/4119