The AnimatedIcon does not have an API for controlling the animation but
relies on the :visible property changes to start and stop a timeout used
to update the frame.
This has the inconvenient of having a side effect when visible is set to
true multiple times, and is not really the API expected from such
component.
Switch to a start/stop API instead. Also, update to the first frame at
startup while we are at it, since this is the expected behavior.
https://bugzilla.gnome.org/show_bug.cgi?id=687583
e04a4c3923