Hi, At some point we will need "Client Side" decorations on JavaFX to support modern gnome desktop on Linux as they moved to have client side decorations on everything. Mutter (the gnome compositor) does not even support "server side" decorations. On Wayland it's an extension for KDE only.
Currently, even on Xorg it's a bit hacky when JavaFX needs to set total window size (with decorations). It caused too many problems. Having controls on the titlebar is a nice feature to have, as seen on many applications (tabs, hamburger menus, buttons). I'm not exactly sure on how it should be done. Maybe a Scene property that enables its contents to be wrapped in a decoration control? Would it break applications that walk through the scene graph? Should it look like Modena and have a JavaFX "identity", or should it try to look like the platform it's in? On Wayland, it would be possible to use a subcompositor to place the decoration behind, but I think it would be better if the decoration was part of the Scene. It would be less problematic on the variety of compositors (Mutter, Kwin, Sway, etc). -- Thiago
