Subsurface Support #65
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The compositor now allows to restack surfaces into arbitrary locations in the z-order. As a first application, these functions are used to implement functions to raise a window to the top or drop them to the bottom of the z-order, which are used to fix the behaviour of floating windows. Windows now restack to the top of the z-order whenever they become floating or when they are moved, which is the same behaviour as dwm. When a window becomes tiled it gets dropped to the bottom of the z-order, thus ensuring that floating windows are always above tiled windows.
Menu bars and other popups in graphical applications should now work properly. The implementation is very rough and still requires a lot of polishing, but it works for now.
Functionality is for now limited to creation, initial rendering and destruction.
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Leaving this hanging around, for visibility, because I use it and while not complete, it's at least something