enthought / enthought/traitsui

Problems with macOS Big Sur and Pyside2 5.15

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toolkit: Qt type: important
Dominant language
Python
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Description

On macOS Big Sur and Pyside2 5.15, there is a problem with qui windows not getting shown. This leads to the test suite hanging forever, examples not launching etc.

It seems this is a known issue: https://www.loekvandenouweland.com/content/pyside2-big-sur-does-not-show-window.html
and the fix is simple - simply set an environment variable `QT_MAC_WANTS_LAYER=1`

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