@brief Deliver a SetProperty request to set WM_TRANSIENT_FOR property value.
@param c The connection to the X server.
@param window Window X identifier.
@param transient_for_window The WM_TRANSIENT_FOR window X identifier.
@return The request cookie.
@brief Deliver a SetProperty request to set WM_TRANSIENT_FOR property value. @param c The connection to the X server. @param window Window X identifier. @param transient_for_window The WM_TRANSIENT_FOR window X identifier. @return The request cookie.