QAbstractFileIconEngine implements the QIconEngine interface
and creates a new interface where subclasses override the
filePixmap() function.
QIconEngine subclasses must now also override scaledPixmap();
add implementation which forwards to filePixmap().
(The intermediate implementation in QPixmapIconEngine is not
used by QAbstractFileIconEngine.)
Pick-to: 6.1
Task-number: QTBUG-91104
Change-Id: I229e3a003ad0c3fff768eac7e75c59fe7145fcaa
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
bb110cee5d