@brief Send GetProperty request to get _NET_ACTIVE_WINDOW root
window property
The window ID of the currently active window or None if no window
has the focus. This is a read-only property set by the Window
Manager. This property SHOULD be set and updated by the Window
Manager.
This form can be used only if the request will cause a reply to be
generated. Any returned error will be placed in the event queue.
@param ewmh The information relative to EWMH
@param screen_nbr The screen number
@return The _NET_ACTIVE_WINDOW cookie of the GetProperty request
@brief Send GetProperty request to get _NET_ACTIVE_WINDOW root window property
The window ID of the currently active window or None if no window has the focus. This is a read-only property set by the Window Manager. This property SHOULD be set and updated by the Window Manager.
This form can be used only if the request will cause a reply to be generated. Any returned error will be placed in the event queue.
@param ewmh The information relative to EWMH @param screen_nbr The screen number @return The _NET_ACTIVE_WINDOW cookie of the GetProperty request