[ Version ( since = "3.20" ) ]
public signal void unmount (MountOperation mount_operation)
The places sidebar emits this signal when it starts a new operation because the user for example ejected some drive or unmounted a mount.
In this way the application using the PlacesSidebar can track the progress of the operation and, for example, show a notification.
| mount_operation |
the MountOperation that is going to start. |