Use QWidget::isVisibleTo(parent) instead of isVisible(), just like
QAbstractScrollArea::replaceScrollBar() does. This removes the need
of using QCoreApplication::processEvents() to deliver the actual
hide event just for testing if the scrollbar was requested to be
hidden as it should.
Change-Id: Ie9a816e7b871d280a4b3d9d76adb10601915bd56
Reviewed-by: J-P Nurmi <jpnurmi@digia.com>
Reviewed-by: Caroline Chao <caroline.chao@digia.com>