Bug 522374. Ignore <area> elements in looking for a next/prev siblings for frame construction due to their misuse of the primary frame map. r=bz

--HG--
extra : rebase_source : 1b996eb1c5c6a130197e84ad11998afae4b20eb9

layout/base/nsCSSFrameConstructor.cpp

@@ -5867,7 +5867,9 @@ nsCSSFrameConstructor::FindFrameForContentSibling(nsIContent* aContent,
                                                   PRBool aPrevSibling)
 {
   nsIFrame* sibling = mPresShell->GetPrimaryFrameFor(aContent);
-  if (!sibling) {
+  if (!sibling || sibling->GetContent() != aContent) {
+    // XXX the GetContent() != aContent check is needed due to bug 135040.
+    // Remove it once that's fixed.
     return nsnull;
   }