RFR: 8344981: [REDO] JDK-6672644 JComboBox still scrolling if switch to another window and return back [v6]

[Alexander Zvegintsev]

On Wed, 19 Feb 2025 23:04:39 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> Redo for JComboBox infinite scrolling issue. The issue is that when a scrollbar is clicked and held, if the user switches focus (ex: ALT+TAB) while scrolling, when focused is returned to the scrolling application, the JComboBox will still be scrolling even though nothing it being clicked.
>> 
>> Previously, a KeyboardFocusListener was added to determine the focus. However, there was a memory leak on Windows and Ubuntu. This current implementation uses the current FocusManager and is overall a cleaner, simpler approach.
>> 
>> CI testing is green on all platforms.
>
> Damon Nguyen has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add test helper

Marked as reviewed by azvegint (Reviewer).

test/jdk/javax/swing/JComboBox/JComboBoxScrollFocusTest.java line 43:

> 41:  * @key headful
> 42:  * @bug 6672644
> 43:  * @requires os.family != "mac"

Is there a reason to exclude it on mac?

Based on my local testing, the issue doesn't affect mac (test passes before and after the fix), but we can still run the test.

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PR Review: https://git.openjdk.org/jdk/pull/23451#pullrequestreview-2634609767
PR Review Comment: https://git.openjdk.org/jdk/pull/23451#discussion_r1966393077