[PyQt] Bug in PyQt Designer plugin

[André]

Hi,
I have a problem when using a threaded third party library in a custom 
widget. Python callbacks which are called from other threads are not 
executed.

Looking at the code of the Designer plugin, python threading is not 
initialized. In the QML Plugin the initialization is correct.

Attached is a patch I tested on my Arch Linux system (PyQt 5.10.1).

André
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