tdf#58186 Update Navigator after promote/demote undo

Change-Id: I736d9d2ed863e0978a9abfecdca7dbf7a30f5d81
Reviewed-on: https://gerrit.libreoffice.org/43407Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Samuel Mehrbrodt <Samuel.Mehrbrodt@cib.de>

sw/source/uibase/utlui/content.cxx

@@ -2320,6 +2320,8 @@ void SwContentTree::Notify(SfxBroadcaster & rBC, SfxHint const& rHint)
     {
         SfxListener::Notify(rBC, rHint);
     }
+    if (SfxHintId::DocChanged == rHint.GetId())
+        m_bViewHasChanged = true;
 }