Blank page with QWebEngineView

[jimmy at spalge.com]

Looks like this issue: https://bugreports.qt.io/browse/QTBUG-103969

The 5.15.2 binary distributable doesn't work with newer glibc versions.

The only workarounds I'm aware of is to pass
--disable-seccomp-filter-sandbox as one of the args to QApplication or to
use a newer WebEngine version (like the one packaged by your distro
instead of the one from PyPI).