// 1) if _NET_WM_STATE_FULLSCREEN is supported, use it
// 2) otherwise try WM-specific hacks (KDE, IceWM)
// 3) use _WIN_LAYER and hope that the WM will recognize it
// 1) if _NET_WM_STATE_FULLSCREEN is supported, use it
// 2) otherwise try WM-specific hacks (KDE, IceWM)
// 3) use _WIN_LAYER and hope that the WM will recognize it