infinite focus changing in toc biblio page

Change-Id: Ic2e36b8921d329d6f9cd2eb68524ed111f6fda75
Reviewed-on: https://gerrit.libreoffice.org/74755
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>
diff --git a/vcl/unx/gtk3/gtk3gtkinst.cxx b/vcl/unx/gtk3/gtk3gtkinst.cxx
index caa1510..4ea1c17 100644
--- a/vcl/unx/gtk3/gtk3gtkinst.cxx
+++ b/vcl/unx/gtk3/gtk3gtkinst.cxx
@@ -1667,7 +1667,9 @@ public:

    virtual void grab_focus() override
    {
        disable_notify_events();
        gtk_widget_grab_focus(m_pWidget);
        enable_notify_events();
    }

    virtual bool has_focus() const override