RFR: 8373967: [macos] User interactions with List do not trigger ItemEvent after programmatic change

[Alexander Zvegintsev]

On Thu, 18 Dec 2025 08:25:37 GMT, Sergey Bylokhov <serb at openjdk.org> wrote:

> The fix in LWListPeer introduced by [JDK-7125456](https://bugs.openjdk.org/browse/JDK-7125456) was intended to suppress ItemEvents for programmatic changes to a List, while still allowing events generated by user interaction.
> 
> The implementation unconditionally bypasses the listener logic:
> https://hg.openjdk.org/jdk7u/jdk7u-osx/jdk/rev/dfa991721457
> Unfortunately that logic also updates the cached selection state. As a result, when the application select something programmatically, the cached state is not updated.
> 
> The change move out the `oldSelectedIndices = source.getSelectedIndices();` from the `!isSkipStateChangedEvent()` condition, plus some cleanup.

LGTM.
I've also verified that CI testing looks good on all platforms.

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Marked as reviewed by azvegint (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/28890#pullrequestreview-3605316595