[jdk20] RFR: 4512626: Non-editable JTextArea provides no visual indication of keyboard focus [v4]

[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:

  Fixing situation where we can be stuck with non-blinking cursor after editable state switched on a focused text field

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Changes:
  - all: https://git.openjdk.org/jdk20/pull/21/files
  - new: https://git.openjdk.org/jdk20/pull/21/files/3b9d9cfe..abf5d77d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk20&pr=21&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk20&pr=21&range=02-03

  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 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