This applies to both the Table and child Playlists models. I'm doing my
own idle handling already for searching, so we can rely on that instead
of needing Gtk to do it. The benefit to this is that we can select
playlists programmatically during startup, since we don't need to worry
about the Table not being fully loaded yet.
Signed-off-by: Anna Schumaker <Anna@NoWheyCreamery.com>