Revert changes made in scroll_sys().

The optimization created some glitches. It now
works properly but it could be improved
performance-wise.

Task-number: QTBUG-5926
Task-number: QTBUG-5994
Reviewed-by: Morten Sorvig

1 files changed, 13 insertions, 1 deletions

diff --git a/src/gui/kernel/qwidget_mac.mm b/src/gui/kernel/qwidget_mac.mm
index 9e7517f..f78596e 100644
--- a/src/gui/kernel/qwidget_mac.mm
+++ b/src/gui/kernel/qwidget_mac.mm
@@ -4475,8 +4475,20 @@ void QWidgetPrivate::scroll_sys(int dx, int dy, const QRect &r)
         }
     }
 
+    // ### Scroll the dirty regions as well, the following is not correct.
+    QRegion displayRegion = r.isNull() ? dirtyOnWidget : (dirtyOnWidget & r);
+    const QVector<QRect> &rects = dirtyOnWidget.rects();
+    const QVector<QRect>::const_iterator end = rects.end();
+    QVector<QRect>::const_iterator it = rects.begin();
+    while (it != end) {
+	const QRect rect = *it;
+	const NSRect dirtyRect = NSMakeRect(rect.x() + dx, rect.y() + dy,
+		rect.width(), rect.height());
+	[view setNeedsDisplayInRect:dirtyRect];
+	++it;
+    }
+
     NSSize deltaSize = NSMakeSize(dx, dy);
-    [view translateRectsNeedingDisplayInRect:scrollRect by:deltaSize];
     [view scrollRect:scrollRect by:deltaSize];
     [view setNeedsDisplayInRect:deltaXRect];
     [view setNeedsDisplayInRect:deltaYRect];