mario:~ $ xprop -name "Minetest [Main Menu]"
_NET_WM_STATE(ATOM) =
WM_STATE(WM_STATE):
		window state: Normal
		icon window: 0x0
_NET_FRAME_EXTENTS(CARDINAL) = 1, 1, 32, 1
_NET_WM_DESKTOP(CARDINAL) = 2
_NET_WM_ALLOWED_ACTIONS(ATOM) = _NET_WM_ACTION_MOVE, _NET_WM_ACTION_RESIZE, _NET_WM_ACTION_FULLSCREEN, _NET_WM_ACTION_MINIMIZE, _NET_WM_ACTION_SHADE, _NET_WM_ACTION_MAXIMIZE_HORZ, _NET_WM_ACTION_MAXIMIZE_VERT, _NET_WM_ACTION_CHANGE_DESKTOP, _NET_WM_ACTION_CLOSE, _NET_WM_ACTION_ABOVE, _NET_WM_ACTION_BELOW
WM_ICON_NAME(STRING) = "Minetest [Main Menu]"
WM_NAME(STRING) = "Minetest [Main Menu]"
WM_NORMAL_HINTS(WM_SIZE_HINTS):
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW


mario:~ $ xprop -name "Minetest [Main Menu]" -format WM_CLASS 8s -set WM_CLASS "Minetest"


mario:~ $ xprop -name "Minetest [Main Menu]"
WM_CLASS(STRING) = "Minetest"
_NET_WM_STATE(ATOM) =
WM_STATE(WM_STATE):
		window state: Normal
		icon window: 0x0
_NET_FRAME_EXTENTS(CARDINAL) = 1, 1, 32, 1
_NET_WM_DESKTOP(CARDINAL) = 2
_NET_WM_ALLOWED_ACTIONS(ATOM) = _NET_WM_ACTION_MOVE, _NET_WM_ACTION_RESIZE, _NET_WM_ACTION_FULLSCREEN, _NET_WM_ACTION_MINIMIZE, _NET_WM_ACTION_SHADE, _NET_WM_ACTION_MAXIMIZE_HORZ, _NET_WM_ACTION_MAXIMIZE_VERT, _NET_WM_ACTION_CHANGE_DESKTOP, _NET_WM_ACTION_CLOSE, _NET_WM_ACTION_ABOVE, _NET_WM_ACTION_BELOW
WM_ICON_NAME(STRING) = "Minetest [Main Menu]"
WM_NAME(STRING) = "Minetest [Main Menu]"
WM_NORMAL_HINTS(WM_SIZE_HINTS):
WM_PROTOCOLS(ATOM): protocols  WM_DELETE_WINDOW