Qt 6.5 heads-up: libxcb-cursor0 needed on CI

[Florian Bruhin]

Hey,

just another quick heads-up for people getting an abort running stuff on
CI with Qt 6.5 when creating a QApplication:

Qt now requires libxcb-cursor0 to be installed:
https://codereview.qt-project.org/c/qt/qtbase/+/325414

To debug those kinds of issues, "export QT_DEBUG_PLUGINS=1" and then
searching for "xcb" in the output will tell you what's missing. If using
pytest, additionally pass the -s option to it, to disable output
capturing.

Florian

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