[jdk20] RFR: 4512626: Non-editable JTextArea provides no visual indication of keyboard focus [v2]

[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.

Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:

  Fixed MultiSelectionText so it is now stable on Linux
  Removed both fixed tests from ProblemList

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Changes:
  - all: https://git.openjdk.org/jdk20/pull/21/files
  - new: https://git.openjdk.org/jdk20/pull/21/files/9463a0bb..70da8f6a

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk20&pr=21&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk20&pr=21&range=00-01

  Stats: 145 lines in 2 files changed: 29 ins; 42 del; 74 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