so...
SAL_USE_VCLPLUGIN=gtk3 make screenshot
for the "unknown dialog" cases of make screenshot, which loads .ui files and
tries to render them, will render them with the native gtk infrastructure
Change-Id: Ifc8fe264155887c4d01b7ce0e2aa53e12acbfcb0
Reviewed-on: https://gerrit.libreoffice.org/80545
Tested-by: Jenkins
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>