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] <mailto:[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. >>>
