We have a queue of these odd relative sizes (which are not XML
attributes but text inside the XML element), if the bitmap doesn't pop
the queue, the following shape won't get its size.

Change-Id: I1602208c9509d8889bf0be254f3b25fb25fafca2
Reviewed-on: https://gerrit.libreoffice.org/52791Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>