@brief Send a ChangeProperty request for _NET_DESKTOP_VIEWPORT
_NET_DESKTOP_VIEWPORT x, y, CARDINAL[][2]/32
@param ewmh The per-screen EWMH information
@param screen_nbr The screen number
@param list_len The number of desktop viewports
@param list The desktop viewports
@return Cookie associated with the ChangeProperty _NET_DESKTOP_VIEWPORT request
@brief Send a ChangeProperty request for _NET_DESKTOP_VIEWPORT
_NET_DESKTOP_VIEWPORT x, y, CARDINAL[][2]/32
@param ewmh The per-screen EWMH information @param screen_nbr The screen number @param list_len The number of desktop viewports @param list The desktop viewports @return Cookie associated with the ChangeProperty _NET_DESKTOP_VIEWPORT request