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 <[email protected]> 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 <[email protected]> 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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