@param c The connection
@param mode A bitmask of #xcb_set_mode_t values.
@param mode Insert to add the specified window to the save set or Delete to delete it from the save set.
@param window The window to add or delete to/from your save set.
@return A cookie
TODO: explain what the save set is for.
This function either adds or removes the specified window to the client's (your
application's) save set.
@brief Changes a client's save set
@param c The connection @param mode A bitmask of #xcb_set_mode_t values. @param mode Insert to add the specified window to the save set or Delete to delete it from the save set. @param window The window to add or delete to/from your save set. @return A cookie
TODO: explain what the save set is for.
This function either adds or removes the specified window to the client's (your application's) save set.