Merge branch 'expander-add-like-bin' into 'master'
authorTimm Bäder <mail@baedert.org>
Wed, 7 Mar 2018 19:09:30 +0000 (19:09 +0000)
committerTimm Bäder <mail@baedert.org>
Wed, 7 Mar 2018 19:09:30 +0000 (19:09 +0000)
expander: Check for an existing child when adding

See merge request GNOME/gtk!48


Trivial merge