Bug 372703. Position child views whenever we place an abs-pos child; even if the child hasn't moved, this frame itself might have, so view offsets might have changed. r=eli,sr=dbaron

layout/generic/nsAbsoluteContainingBlock.cpp

@@ -418,11 +418,16 @@ nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame*                aDelegat
                kidDesiredSize.width, kidDesiredSize.height);
   aKidFrame->SetRect(rect);
 
-  // Size and position the view and set its opacity, visibility, content
-  // transparency, and clip
-  nsContainerFrame::SyncFrameViewAfterReflow(aPresContext, aKidFrame,
-                                             aKidFrame->GetView(),
-                                             &kidDesiredSize.mOverflowArea);
+  nsIView* view = aKidFrame->GetView();
+  if (view) {
+    // Size and position the view and set its opacity, visibility, content
+    // transparency, and clip
+    nsContainerFrame::SyncFrameViewAfterReflow(aPresContext, aKidFrame,
+                                               view,
+                                               &kidDesiredSize.mOverflowArea);
+  } else {
+    nsContainerFrame::PositionChildViews(aKidFrame);
+  }
 
   if (oldRect.TopLeft() != rect.TopLeft() || 
       (aDelegatingFrame->GetStateBits() & NS_FRAME_FIRST_REFLOW) ||
@@ -436,7 +441,6 @@ nsAbsoluteContainingBlock::ReflowAbsoluteFrame(nsIFrame*                aDelegat
     aKidFrame->GetParent()->Invalidate(oldOverflowRect);
     aKidFrame->GetParent()->Invalidate(kidDesiredSize.mOverflowArea +
                                        rect.TopLeft());
-    nsContainerFrame::PositionChildViews(aKidFrame);
   } else if (oldRect.Size() != rect.Size()) {
     // Invalidate the area where the frame changed size.
     nscoord innerWidth = PR_MIN(oldRect.width, rect.width);