public void set_sm_client_id (string? sm_client_id)
Sets the `SM_CLIENT_ID` property on the application’s leader window so that the window manager can save the application’s state using the X11R6 ICCCM session management protocol.
See the X Session Management Library documentation for more information on session management and the Inter-Client Communication Conventions Manual
the client id assigned by the session manager when the connection was opened, or null to remove the property.