Fix for smoketest blocker bug 253180 enabled xul control elements aren't necessarily focusable patch in bug 250006 r=aaronlev sr=jst

content/xul/content/src/nsXULElement.cpp

@@ -1448,7 +1448,7 @@ nsXULElement::IsFocusable(PRInt32 *aTabIndex)
     *aTabIndex = tabIndex;
   }
 
-  return !disabled;
+  return tabIndex >= 0;
 }