Broken QtQuickControls combobox items

[Marco Martin]

Hi all,
we are all quite annoyed by this bug:
https://bugs.kde.org/show_bug.cgi?id=340043

I tried to track it and I think the problem is qtquickcontrols making the 
assumption that the itemsin the combobox are always the same height as the 
text (as default styles do)
however oxygen and breeze do override it in order to have things a bit more 
spaced, causing the qml version to break.

I tried to fix qtquickcontrols, here
https://codereview.qt-project.org/#/c/98191/

so, if you think this approach makes sense, please vote ;)

-- 
Marco Martin