instead of waiting until gaining focus of the listbox,
because of the differences in what that focus means in
the different backends. It was an odd way to do things anyway.

Change-Id: I072e3da04db184b49a86a9888080b60223813729
Reviewed-on: https://gerrit.libreoffice.org/63821
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>