RFR: 8372453: [macOS] Iconifying owner may not iconify owned window

[Kevin Rushforth]

On Wed, 26 Nov 2025 21:35:08 GMT, Martin Fox <mfox at openjdk.org> wrote:

>> In the macOS glass code an owned window is referred to as a child window and its owner is referred to as the parent. When a parent is iconified the glass code "iconifies" its children which is to say it hides them. Under the right circumstances the children may get ordered back to the front and made visible almost immediately.
>> 
>> Details are in the bug report but when a window is iconified it may trigger the OS to notify every window that its NSScreen has changed (yes, this is weird). This causes reorderChildWindows to be called on the newly iconified parent and the process of re-ordering the child windows can cause hidden windows to be made visible. For some reason the NSScreen strangeness only happens if "System Settings > Desktop & Dock > Minimize windows into application icon" is turned OFF. This is not the first time we've encountered this, see [JDK-8353902](https://bugs.openjdk.org/browse/JDK-8353902)
>> 
>> This PR fixes the problem in two ways. If reorderChildWindows is called on an iconified window it does nothing. If one of the child windows is hidden it is not re-ordered since that might make it visible.
>
> I've been testing on macOS 15 so maybe Apple fixed this in 26. When I finally make peace with Liquid Glass and install 26 I'll do some additional testing.

@beldenfox Would you be willing to backport this to `jfx25u`? If so, navigate to commit 6234c07e0e7ef84145e8a17407bf983ddba13d05 and enter `/backport jfx25u` as a comment and follow the instructions. If you're not able to, I'll get someone else to backport it.

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PR Comment: https://git.openjdk.org/jfx/pull/1985#issuecomment-3596529907