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

[Prasanta Sadhukhan]

On Thu, 6 Feb 2025 17:28:59 GMT, Damon Nguyen <dnguyen at openjdk.org> wrote:

>> I initially separated it to make it clear that this is for focus. I'll edit this and modify the existing comment to include null focus.
>
> I tested different ways to merge this block with the below blocks. I'm not sure if it makes sense to do so now because it wouldn't be as simple as adding `|| focusOwner == null` to the first if-statement or appending the logic to the `else` block. I would still need another if or else/if block regardless. And I think it's harder to follow than the current implementation. Let me know if you prefer it a different way, but I think the current implementation is better for now.

I was thinking more of `if (!par.isEnabled() !! focusOwner == null)` as the parent is still JFrame.

But, I was trying to run the testcase mentioned in the JBS and this regression test but I am not able to reproduce without the fix..
It doesn't keep on scrolling when it regains focus in my windows 11 machine..

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PR Review Comment: https://git.openjdk.org/jdk/pull/23451#discussion_r1946037272