we've been here before with...

commit a9cf50c2
Date:   Mon Sep 30 15:28:02 2013 +0100

    junit: make tests robust by compensating for intermittent sizing race.

so lets fetch the bounds fresh when checking its consistency with the
other measurements and placements rather than comparing against its
earlier perhaps now changed value

Change-Id: I24585901fedfd710fee194fab697b445f8633e73
Reviewed-on: https://gerrit.libreoffice.org/40318Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>