[Oxygen] [Bug 403978] oxygen theme incompatible with qt5 5.12.1-1 libs

[Benjamin Robin]

https://bugs.kde.org/show_bug.cgi?id=403978

--- Comment #21 from Benjamin Robin <benjarobin+kde at gmail.com> ---
I finally found the true origin of this bug (I have to learn how to debug
QML...)
The bug is triggered by the following QML line of code:

height: __styleData.horizontal ? implicitHeight : extent

from /usr/lib/qt/qml/QtQuick/Controls/Styles/Base/ScrollViewStyle.qml line 380

The problem comes from the computation of the "extent" variable. When the bug
occurs (more than once, 14 times on my system):
 - The flickableItem is valid (We are not using bg.width or bg.height)
 - A division by 0 occurs (flickableItem.contentWidth and
flickableItem.contentHeight are eaquals to 0)

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