Merge branch 'modern-testsuite' into 'master'
authorBenjamin Otte <otte.benjamin@googlemail.com>
Thu, 16 Sep 2021 22:22:56 +0000 (22:22 +0000)
committerBenjamin Otte <otte.benjamin@googlemail.com>
Thu, 16 Sep 2021 22:22:56 +0000 (22:22 +0000)
testsuite: modernize image handling

Closes #4261

See merge request GNOME/gtk!3955


Trivial merge