uitest for bug tdf#123313

https://bugs.documentfoundation.org/show_bug.cgi?id=123313#c9

Change-Id: Id72829984affbb1c4ce5bba4704e19a560260357
Reviewed-on: https://gerrit.libreoffice.org/71418
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

sw/qa/uitest/writer_tests5/tdf123446.py

@@ -38,7 +38,8 @@ class tdf123446(UITestCase):
         #- Redo the ToC insertion.
         self.xUITest.executeCommand(".uno:Redo")
         #=> Crash.  Now we verify the text
-        #self.xUITest.executeCommand(".uno:Undo")   # This second undo crash in Clang build
+        # This second undo crash in Clang build https://bugs.documentfoundation.org/show_bug.cgi?id=123313#c9
+        self.xUITest.executeCommand(".uno:Undo")
         self.assertEqual(document.Text.String[0:7], "LibreOf")
 
         self.ui_test.close_doc()