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stacking: Don't update layer when dropping _NET_WM_STATE_ABOVE from fullscreen windows.

Zhiyi Zhang requested to merge zzhang/xfwm4:bug-22269-xfce-ws-ex-topmost into master

If a normal window is created with _NET_WM_STATE_ABOVE and _NET_WM_STATE_FULLSCREEN, and then _NET_WM_STATE_ABOVE gets removed. The window should still reside above of WIN_LAYER_DOCK instead of reset to initial_layer, which is WIN_LAYER_NORMAL and below WIN_LAYER_DOCK.

According to the recommended stacking order specified in EWMH, focused fullscreen windows should be on top of other windows, but cdcce736 explicitly changed that so I didn't pursue full EWMH conformance.

Fix some games such as Deus Ex: Game of the Year Edition and The Witcher 3 having their fullscreen windows behind xfce4-panel after changing resolution in-game when running on Proton.

Signed-off-by: Zhiyi Zhang

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