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

[Alexander Zuev]

On Fri, 2 Dec 2022 23:52:55 GMT, Alexander Zuev <kizune at openjdk.org> wrote:

>> Set the text caret to be visible but not blinking on the non-editable text area.
>
> Alexander Zuev has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Handling the case when blink rate is set while component is unedited
>   Test HidingSelectionTest.java is rewritten and corrected.

I added the setBlinkRate handling when component is unedited so the new rate is preserved.

Also setting blink rate to a negative value causes InvalidArgumentException because it is checked further down the line in javax.swing.Timer.checkDelay() method so it is a non-issue.

Finally the HidingSelectionTest had to be re-written because its logic is incorrect and it passes on MacOS and Windows only because of the flaw in the test that allows false positive.

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PR: https://git.openjdk.org/jdk/pull/11408