Maximized stages do not resize when needed on Windows

[Christopher Schnick]

See JDK-8378416

On 23/02/2026 02:01, Christopher Schnick wrote:
>
> Oh, totally forgot about that for a few days. I will create one now
>
> On 23/02/2026 01:59, Martin Fox wrote:
>> Christopher,
>>
>> Did you enter a bug on this? I couldn’t find one. If you didn’t enter 
>> one I will.
>>
>> It is a bug in JavaFX, we’re mishandling WM_WINDOWPOSCHANGING but the 
>> bug appears to be in some Java code that I’m not familiar with 
>> (notifyMoving in WinWindow.java).
>>
>> Martin
>>
>>> On Feb 16, 2026, at 1:51 PM, Christopher Schnick 
>>> <crschnick at xpipe.io> wrote:
>>>
>>> Other non-JavaFX applications work fine, they stay maximized and 
>>> resize to the new size. So probably JavaFX does not like resizing a 
>>> window when it is maximized.
>>>
>>> On 16/02/2026 22:49, Thiago Milczarek Sayão wrote:
>>>> I think windows will let you resize a maximized window, which is 
>>>> weird.
>>>>
>>>> The logical behaviour would be to unmaximize the window when moved.
>>>>
>>>> Em seg., 16 de fev. de 2026 às 14:32, Christopher Schnick 
>>>> <crschnick at xpipe.io> escreveu:
>>>>
>>>>     On Windows, you can move a window (even if maximized) to
>>>>     another screen
>>>>     with Win+Shift+Arrow key. When doing this, a JavaFX stage does not
>>>>     resize itself to the new screen if the other screen has a
>>>>     different
>>>>     size. You get stuck with an application where the titlebar
>>>>     looks like it
>>>>     is in fullscreen, but it does not fill the screen.
>>>>
>>>>     I would suspect there is some kind of rule built into some
>>>>     JavaFX part
>>>>     that internally prevents resizing maximized windows? Because I
>>>>     have only
>>>>     seen this happen with JavaFX windows so far.
>>>>
>>>>     I can open a ticket for this, but I would have no idea how to
>>>>     fix this
>>>>     issue.
>>>>
>>
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