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

[Prasanta Sadhukhan]

On Tue, 4 Feb 2025 23:35:32 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.

src/java.desktop/share/classes/javax/swing/plaf/basic/BasicScrollBarUI.java line 1625:

> 1623:                     scrollbar.setValueIsAdjusting(false);
> 1624:                     return;
> 1625:                 }

Can't it be merged with below frame disable logic as it does the same thing?

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PR Review Comment: https://git.openjdk.org/jdk/pull/23451#discussion_r1942377136