xwm: Support _NET_WM_STATE_FULLSCREEN
We can now handle fullscreen X windows. X clients request to go fullscreen
buy sending a _NET_WM_STATE client message to the root window. When that
happens we call into the shell interface and asks the shell to make the
surface fullscreen. The shell will then resize the window, which causes
the X wm to configure the X window appropriately.
Make sure we ignore configure requests from fullscreened clients and send out
the synthetic configure notify as required in that case.
Finally, inspect _NET_WM_STATE before mapping so we can handle initial
fullscreen correctly.
3 files changed
