For some reason, each column in a QColumnView is a QAbstractItemView,
*including* the preview widget's column. Unfortunately,
the preview widget's column class was not overriding scrollContentsBy,
so scrolling it had no effect.
A more comprehensive solution would be a major refactoring of the
code to make that column a plain Q(Abstract)ScrollArea, as it doesn't
need QAIV's APIs at all, but I don't want to change code and risk
breaking behavior.
Change-Id: Ice500a8eaef13c295df4cc274b9f80d9a24c65f4
Task-number: QTBUG-11392
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Reviewed-by: Alexander Volkov <a.volkov@rusbitech.ru>
Reviewed-by: Thorbjørn Lund Martsum <tmartsum@gmail.com>
ea17cc0768