[jdk11u-dev] RFR: 8315804: Open source several Swing JTabbedPane JTextArea JTextField tests

[Andrew Lu]

I backport this for parity with 11.0.25-oracle.

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

Commit messages:
 - Backport 24c3d86f32a2e2d9cb24cd8827ef1f20bb53fead

Changes: https://git.openjdk.org/jdk11u-dev/pull/2738/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2738&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315804
  Stats: 496 lines in 5 files changed: 496 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2738.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2738/head:pull/2738

PR: https://git.openjdk.org/jdk11u-dev/pull/2738