RFR: 8348936: [Accessibility,macOS,VoiceOver] VoiceOver doesn't announce untick on toggling the checkbox with "space" key on macOS [v4]

[Abhishek Kumar]

> VoiceOver doesn't announce the _untick state_ when Checkbox is `deselected` using **space** key. When CheckBox is deselected, the state change is not notified to a11y client (VoiceOver) and so the state is not announced by VO. 
> 
> Screen Magnifier is also unable to magnify the unchecked state of JCheckBox due to same reason and is captured as separate bug [JDK-8345728](https://bugs.openjdk.org/browse/JDK-8345728).
> 
> Proposed fix is to send the state change notification to a11y client when checkbox is deselected, this resolves the problem for VoiceOver and Screen Magnifier.
> 
> Similar issue observed for JToggleButton. So, I extended the fix for JToggleButton as well.
> 
> The proposed change can be verified the manual test in the PR.
> 
> CI pipeline testing is `OK`, link posted in JBS.

Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:

  Minor test instruction formatting

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23436/files
  - new: https://git.openjdk.org/jdk/pull/23436/files/0418694c..acb4ad65

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23436&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23436&range=02-03

  Stats: 4 lines in 1 file changed: 1 ins; 0 del; 3 mod
  Patch: https://git.openjdk.org/jdk/pull/23436.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23436/head:pull/23436

PR: https://git.openjdk.org/jdk/pull/23436