Bug 739004. When cloning a static clone, set the mOriginalDocument of the new clone to the mOriginalDocument of the thing being cloned, not to the thing being cloned (which is not an original document at all). r=smaug

content/base/public/nsIDocument.h

@@ -1421,7 +1421,11 @@ public:
    * If this document is a static clone, this returns the original
    * document.
    */
-  nsIDocument* GetOriginalDocument() { return mOriginalDocument; }
+  nsIDocument* GetOriginalDocument()
+  {
+    MOZ_ASSERT(!mOriginalDocument || !mOriginalDocument->GetOriginalDocument());
+    return mOriginalDocument;
+  }
 
   /**
    * Called by nsParser to preload images. Can be removed and code moved

content/base/src/nsDocument.cpp

@@ -8086,9 +8086,12 @@ nsIDocument::CreateStaticClone(nsISupports* aCloneContainer)
   nsCOMPtr<nsIDocument> clonedDoc;
   if (NS_SUCCEEDED(rv)) {
     clonedDoc = do_QueryInterface(clonedNode);
-    nsCOMPtr<nsIDOMDocument> clonedDOMDoc = do_QueryInterface(clonedDoc);
-    if (clonedDOMDoc) {
-      clonedDoc->mOriginalDocument = this;
+    if (clonedDoc) {
+      if (IsStaticDocument()) {
+        clonedDoc->mOriginalDocument = mOriginalDocument;
+      } else {
+        clonedDoc->mOriginalDocument = this;
+      }
       PRInt32 sheetsCount = GetNumberOfStyleSheets();
       for (PRInt32 i = 0; i < sheetsCount; ++i) {
         nsRefPtr<nsCSSStyleSheet> sheet = do_QueryObject(GetStyleSheetAt(i));

layout/base/nsPresShell.cpp

@@ -1413,11 +1413,8 @@ PresShell::SetPrefNoScriptRule()
   // also handle the case where print is done from print preview
   // see bug #342439 for more details
   nsIDocument* doc = mDocument;
-  if (mPresContext->Type() == nsPresContext::eContext_PrintPreview ||
-      mPresContext->Type() == nsPresContext::eContext_Print) {
-    while (doc->GetOriginalDocument()) {
-      doc = doc->GetOriginalDocument();
-    }
+  if (doc->IsStaticDocument()) {
+    doc = doc->GetOriginalDocument();
   }
 
   bool scriptEnabled = doc->IsScriptEnabled();