widget show() / hide() crashes application

[stfl <ste lendl gmail com>]

I am writing a Python 3 GStreamer Client application.
I receive fps measurments from fpsdisplaysink as a GStreamer Signal.
If the fps drops too low I dissplay an overlay over the gtksink (which is
connected to the fpsdisplaysink).

When I show() and hide() the overlayed Gtk.Box sometimes the entire
application crashes.

I noticed that this happens when showing and hiding goes too close together.
Also guarding it with 1.5s leads to such a crash.

After some time of trying I saw this error message which is usually not
displayed.







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