block/unblock notify events for TextView text/selection change

Change-Id: I7745c04b9331b98c9c405544fe262c24ed066ddd
Reviewed-on: https://gerrit.libreoffice.org/71731
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>

vcl/source/app/salvtables.cxx

@@ -3940,12 +3940,16 @@ public:
 
     virtual void set_text(const OUString& rText) override
     {
+        disable_notify_events();
         m_xTextView->SetText(rText);
+        enable_notify_events();
     }
 
     virtual void replace_selection(const OUString& rText) override
     {
+        disable_notify_events();
         m_xTextView->ReplaceSelected(rText);
+        enable_notify_events();
     }
 
     virtual OUString get_text() const override