Make sure to flush out content and style updates when calling sizeToContent.

Bug 244235, r+sr=jst

content/base/src/nsDocumentViewer.cpp

@@ -2674,6 +2674,11 @@ NS_IMETHODIMP DocumentViewerImpl::SizeToContent()
    GetPresShell(getter_AddRefs(presShell));
    NS_ENSURE_TRUE(presShell, NS_ERROR_FAILURE);
 
+   // Flush out all content and style updates.  Note that we don't need to
+   // flush layout since we're about to do a top-level resize reflow, and we
+   // shouldn't have any parents to propagate the flush to.
+   mDocument->FlushPendingNotifications(Flush_Style);
+                                        
    NS_ENSURE_SUCCESS(presShell->ResizeReflow(NS_UNCONSTRAINEDSIZE,
       NS_UNCONSTRAINEDSIZE), NS_ERROR_FAILURE);
 

dom/src/base/nsGlobalWindow.cpp

@@ -2673,17 +2673,9 @@ GlobalWindowImpl::SizeToContent()
     return NS_OK;
   }
 
-  nsCOMPtr<nsIDocShellTreeItem> docShellAsItem(do_QueryInterface(mDocShell));
-  NS_ENSURE_TRUE(docShellAsItem, NS_ERROR_FAILURE);
-
-  nsCOMPtr<nsIDocShellTreeItem> docShellParent;
-  docShellAsItem->GetSameTypeParent(getter_AddRefs(docShellParent));
-
-  // It's only valid to access this from a top window. Doesn't work from
-  // sub-frames.
-  if (docShellParent)
-    return NS_ERROR_FAILURE;
-
+  // The content viewer does a check to make sure that it's a content
+  // viewer for a toplevel docshell.
+  
   nsCOMPtr<nsIContentViewer> cv;
   mDocShell->GetContentViewer(getter_AddRefs(cv));
   nsCOMPtr<nsIMarkupDocumentViewer> markupViewer(do_QueryInterface(cv));

layout/base/nsDocumentViewer.cpp

@@ -2674,6 +2674,11 @@ NS_IMETHODIMP DocumentViewerImpl::SizeToContent()
    GetPresShell(getter_AddRefs(presShell));
    NS_ENSURE_TRUE(presShell, NS_ERROR_FAILURE);
 
+   // Flush out all content and style updates.  Note that we don't need to
+   // flush layout since we're about to do a top-level resize reflow, and we
+   // shouldn't have any parents to propagate the flush to.
+   mDocument->FlushPendingNotifications(Flush_Style);
+                                        
    NS_ENSURE_SUCCESS(presShell->ResizeReflow(NS_UNCONSTRAINEDSIZE,
       NS_UNCONSTRAINEDSIZE), NS_ERROR_FAILURE);