The test for QtWebEngine was removed because something weird happened
with the two pytest-bdd tags, and I'm too annoyed with everything being
broken to investigate now... Future me, I'm sorry.
Fixes#1911.
The bugfix is backported in my qt5-webengine-debug package, and
QUTE_QTBUG54419_PATCHED can be set to force qutebrowser to use
createWindow.