Merge branch 'picture-nullable-setters' into 'master'
authorMatthias Clasen <mclasen@redhat.com>
Wed, 26 May 2021 11:46:23 +0000 (11:46 +0000)
committerMatthias Clasen <mclasen@redhat.com>
Wed, 26 May 2021 11:46:23 +0000 (11:46 +0000)
picture: Make setters actually take NULL

Closes #3974

See merge request GNOME/gtk!3598


Trivial merge