Control GUI hangs after resizing the window

[ltjax]

Happens when built on windows with msys2.
Reproducible every time.

Just open the gui, e.g. with the mock cam, and resize the window -> it'll stop responding

[matze]

I do not have a Windows machine, so there is low chance I come around fixing this. But I'll keep this open in the hope that we find a student to fix interoperability issues.