Merge branch 'scalebutton' into 'master'
authorTimm Bäder <mail@baedert.org>
Mon, 23 Nov 2020 07:38:17 +0000 (07:38 +0000)
committerTimm Bäder <mail@baedert.org>
Mon, 23 Nov 2020 07:38:17 +0000 (07:38 +0000)
properly set ScaleButton's parent_class

Closes #3381

See merge request GNOME/gtk!2877


Trivial merge