Backed out changeset 636a1f8ef224

layout/base/nsLayoutUtils.cpp

@@ -1295,7 +1295,7 @@ AddItemsToRegion(nsDisplayListBuilder* aBuilder, nsDisplayList* aList,
           nsRegion clippedOutDestination;
           clippedOutDestination.Sub(aUpdateRect, clip);
  #ifdef DEBUG
-          PrintAddedRegion("Adding region for clipped out destination frame %p",
+          PrintAddedRegion("Adding region for clipped out source frame %p",
                            clipFrame, clippedOutDestination);
  #endif
           aRegion->Or(*aRegion, clippedOutDestination);

widget/src/cocoa/nsChildView.mm

@@ -1755,24 +1755,6 @@ void nsChildView::Scroll(const nsIntPoint& aDelta,
       }
     }
 #endif // NS_LEOPARD_AND_LATER
-    // Invalidate the area that was scrolled into view from outside the window
-    // First, compute the destination region whose source was outside the
-    // window. We do this by subtracting from destRegion the window bounds,
-    // translated by the scroll amount.
-    NSView* rootView = [[mView window] contentView];
-    NSRect rootViewRect = [rootView frame];
-    rootViewRect.origin = NSMakePoint(0, 0);
-    rootViewRect = [mView convertRect:rootViewRect fromView: rootView];
-    nsIntRect windowBounds;
-    NSRectToGeckoRect(rootViewRect, windowBounds);
-    destRegion.Sub(destRegion, windowBounds + aDelta);
-    nsIntRegionRectIterator iter(destRegion);
-    const nsIntRect* invalidate;
-    while ((invalidate = iter.Next()) != nsnull) {
-      NSRect rect;
-      GeckoRectToNSRect(*invalidate, rect);
-      [mView setNeedsDisplayInRect:rect];
-    }
 
     // Leopard, at least, has a nasty bug where calling scrollRect:by: doesn't
     // actually trigger a window update. A window update is only triggered