[jdk20] RFR: 4512626: Non-editable JTextArea provides no visual indication of keyboard focus

[Alexander Zuev]

Set the text caret to be visible but not blinking on the non-editable text area. Fix the regression test that becames unstable after the change.

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Commit messages:
 - 4512626: Non-editable JTextArea provides no visual indication of keyboard focus

Changes: https://git.openjdk.org/jdk20/pull/21/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20&pr=21&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-4512626
  Stats: 68 lines in 2 files changed: 24 ins; 34 del; 10 mod
  Patch: https://git.openjdk.org/jdk20/pull/21.diff
  Fetch: git fetch https://git.openjdk.org/jdk20 pull/21/head:pull/21

PR: https://git.openjdk.org/jdk20/pull/21