Hi, JavaFX allows setting the stage's width, height, and position (X, Y) when it is maximized or in fullscreen mode, without ignoring the values or throwing an exception.
The current documentation states the following regarding X, Y, Width, Height, and sizeToScene: Changing this attribute will not visually affect a Stage while fullScreen is true, but will be honored by the Stage once fullScreen becomes false. This value includes any and all decorations which may be added by the Operating System such as resizable frame handles. Typical applications will set the Scene <https://docs.oracle.com/javase/8/javafx/api/javafx/scene/Scene.html> width instead. It doesn’t mention anything about the maximized state, which I believe is a similar case. Martin did some tests on Mac and Windows when resizing while Maximized, and it seems inconsistent between platforms. https://github.com/openjdk/jfx/pull/1748#issuecomment-2764224914 On Linux, when setting the width or height while in fullscreen mode, GTK simply ignores the request and maintains the size the window had before entering fullscreen. I tried to work around this to align with the documentation, but it’s harder than it looks due to the asynchronous nature of X11. Depending on how different platforms behave, it might be worth revisiting the documentation and aligning behaviors where possible to ensure consistency. -- Thiago.
