The tree view in the input and the output tab uses the "selection-changed"
signal. This implies that when a row is removed (e.g. when unplugging heaphones) g-c-c
will receive the signal and try to change the active port. G-c-c should not be the one
deciding deciding which port should be active, the user or PA are smart enough. We
should descard selection-changed events that are not triggered by an user interaction.
https://bugzilla.gnome.org/show_bug.cgi?id=789551
dc46487081