Partial fix for bug 42098 -- leakage of XUL doc and editor in composer window. This change fixes the doc leak, but the nsEditorShell still leaks. This fix is a band-aid until 42530 is fixed. r=hyatt

editor/ui/composer/content/editor.js

@@ -163,7 +163,8 @@ function EditorStartup(editorType, editorElement)
   }
 
   // store the editor shell in the window, so that child windows can get to it.
-  editorShell = editorElement.editorShell;
+  editorShell = editorElement.editorShell;        // this pattern exposes a JS/XBL bug that causes leaks
+//  editorShell = editorElement.boxObject.QueryInterface(Components.interfaces.nsIEditorBoxObject).editorShell;
   
   editorShell.Init();
   editorShell.SetEditorType(editorType);