Remove the anonymous content for resizers properly. b=420439 r+sr=peterv a1.9+=damons

git-svn-id: svn://10.0.0.236/trunk@250164 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/editor/libeditor/html/nsHTMLAbsPosition.cpp

@@ -334,6 +334,11 @@ nsHTMLEditor::ShowGrabberOnElement(nsIDOMElement * aElement)
 {
   NS_ENSURE_ARG_POINTER(aElement);
 
+  if (mGrabber) {
+    NS_ERROR("call HideGrabber first");
+    return NS_ERROR_UNEXPECTED;
+  }
+
   nsAutoString classValue;
   nsresult res = CheckPositionedElementBGandFG(aElement, classValue);
   if (NS_FAILED(res)) return res;