draft: kstyle: unmirror Qt's horizontal scrollbar behaviour in RtL

Jan Blackquill requested to merge work/janb/unmirror into master

This seems to be what was originally intended, and may have broken somewhere in the 7 years we've had the QStyle around.

Mirrored horizontal scrollbars don't really make sense, since scrollbars don't relate to text direction, they relate to the positioning of the viewport on a view. If the viewport is on the left of a view, the scrollbar should be on the left, regardless of the text direction.

This is also more consistent with other software handling RtL well, which users will be accustomed to.

Edited by Jan Blackquill

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