notification-content: Make sure we disconnect on dispose
Use g_signal_connect_object() instead of g_signal_connect() so that if self goes away the signal handler gets disconnected.
The notification might live way longer than the content, e.g. when a banner expires but the notification is still in the notification list.
Closes: #321 (closed)
Signed-off-by: Guido Günther guido.gunther@puri.sm
Edited by Guido Gunther