oox smartart, linear layout: limit height of children to parent size
Constraints are OK to request more, but it seems PowerPoint doesn't
allow leaving the parent, which simplifies the layout as well.
(cherry picked from commit
b7481a026348c3417fa13a440312521dccee9ec8)
Change-Id: Id67a8740f1eff506e4beae0c797ad50e0218dfe6
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/100114
Tested-by: Jenkins CollaboraOffice <jenkinscollaboraoffice@gmail.com>
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>