Visual Regression starting with Qt 5.14.2

[David Redondo]

Since Plasma 5.19 depends on Qt 5.14 I wanted to give a quick heads up that 
there is a visual regression from 5.14.1 to 5.14.2 and 5.15. This causes 
unnecessary/nonfunctioning horizontal scrollbars to appear in vertical QML 
Listviews (and vertical scrollbars in horizontal views, but that's not that 
common in plasma).
https://bugs.kde.org/show_bug.cgi?id=419514
This was caused by this Qt commit
https://code.qt.io/cgit/qt/qtdeclarative.git/commit/?
id=a82b1b278ace7a500f95473f2a873923d2d4e60a
and reported here:
https://bugreports.qt.io/browse/QTBUG-83890
I submitted a patch 
https://codereview.qt-project.org/c/qt/qtdeclarative/+/300187
that fixes this issue but it's not merged yet.

If you're shipping Qt 5.14, you may want to consider either reverting this 
commit or including the pending fix since it may leave behind a bad first 
impression after upgrading/installation for your users.

Regards,
David