Add optional loading indicator (WIP) #21
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This is a bit simpler than Gtk.Spinner, which doesn't seem to actually spin if some code is blocking. Some kind of an async dance would probably be required to make that work as intended.
There's a bizarre need for a tiny sleep here for the icon to actually change. It could be that the
1/100 s1/10 s that is enough on my system might not be enough on someone else's system.Closes #18