Fix for bug 430624 (Crash [@ nsDocShellEditorData::DetachFromWindow] with spellcheck attribute). Patch by cpearce, r=peterv, sr=jst.

git-svn-id: svn://10.0.0.236/trunk@251098 18797224-902f-48f8-a5cc-f745e15eee43

mozilla/content/html/document/src/nsHTMLDocument.cpp

@@ -3971,6 +3971,10 @@ nsHTMLDocument::SetEditingState(EditingState aState)
 nsresult
 nsHTMLDocument::EditingStateChanged()
 {
+  if (mRemovedFromDocShell) {
+    return NS_OK;
+  }
+
   if (mEditingState == eSettingUp || mEditingState == eTearingDown) {
     // XXX We shouldn't recurse.
     return NS_OK;