Hi Rene,
I usually just test on ubuntu16.04 with GTK3.18. Now you have me checking a few things with GTK3.22. I have been working on a small drawing program that doesn't use sockets or plugs and it does the same flickering on GTK3.22 especially with animation but it works fine with GTK3.18.
https://github.com/cecashon/OrderedSetVelociRaptor/blob/master/Misc/cairo_drawings/bezier_points1.c
Good that you filed a bug report. I think that the flickering may affect more than just the plug and socket.
Eric
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