triggered by change...

commit f9bb1341
Author: Juergen Funk <juergen.funk_ml@cib.de>
Date:   Fri May 13 10:42:17 2016 +0200

    tdf#99815 use XNotifyingDispatch in sfx2

which allowed the problem introduced by...

commit d0c3c24d
Author: Kohei Yoshida <kohei.yoshida@gmail.com>
Date:   Wed Jun 6 01:28:55 2012 -0400

    Check if the system window has a close handler, and if yes, call it.

    This allows the close event in the preview window to be handled in a
    custom fashion, instead of having it call the normal "close window"
    command.

to show up

Change-Id: I5c46fb7a49ae44fd748b5b7192aeb951c7d65191