One thing I want to do is in an eventhandler of a button released
event which takes minutes in duration to change the state of the
statusbar indicating something is going on.
But the statusbar is not redrawn before the evenhandler finishes.
Better would be to start a new thread but D-spwawn-threads can
not call member functions of the MainWindow calls so some
plumbing with gtk is needed. This thread would coexist with the
gtk main eventloop. The GTK docs on this look overwhelmingly
complicated at first.
