Make sure that first-lines with descendant views will be flagged appropriately.

Bug 291078, r+sr=roc

layout/base/nsCSSFrameConstructor.cpp

@@ -11656,6 +11656,15 @@ ReparentFrame(nsFrameManager* aFrameManager,
 {
   aFrame->SetParent(aNewParentFrame);
   aFrameManager->ReParentStyleContext(aFrame);
+  if (aFrame->GetStateBits() &
+      (NS_FRAME_HAS_VIEW | NS_FRAME_HAS_CHILD_WITH_VIEW)) {
+    // No need to walk up the tree, since the bits are already set
+    // right on the parent of aNewParentFrame.
+    NS_ASSERTION(aNewParentFrame->GetParent()->GetStateBits() &
+                   NS_FRAME_HAS_CHILD_WITH_VIEW,
+                 "aNewParentFrame's parent should have this bit set!");
+    aNewParentFrame->AddStateBits(NS_FRAME_HAS_CHILD_WITH_VIEW);
+  }
 }
 
 // Special routine to handle placing a list of frames into a block