Bug 857336 - Always allow PresShell::GoToAnchor to scroll when called from nsDocShell::ScrollToAnchor. r=roc

docshell/base/nsDocShell.cpp

@@ -9718,6 +9718,11 @@ nsDocShell::ScrollToAnchor(nsACString & aCurHash, nsACString & aNewHash,
         return NS_OK;
     }
 
+    nsIScrollableFrame* rootScroll = shell->GetRootScrollFrameAsScrollable();
+    if (rootScroll) {
+        rootScroll->ClearDidHistoryRestore();
+    }
+
     // If we have no new anchor, we do not want to scroll, unless there is a
     // current anchor and we are doing a history load.  So return if we have no
     // new anchor, and there is no current anchor or the load is not a history