Jonas Ådahl authored Jun 27, 2019 and Marco Trevisan committed Jul 04, 2019

The commit

commit 60f7ff3a
Author: Georges Basile Stavracas Neto <georges.stavracas@gmail.com>
Date:   Fri Dec 21 18:12:49 2018 -0200

    window-actor: Turn into a derivable class

made the previous instance struct a instance private struct, but didn't
remove the parent field. Since it's unused, there is no point in keeping
it around, so lets drop it.

!658


(cherry picked from commit 7229a07b)