This is a plugin for Redmine. This plugin changes Redmine's selectbox searchable.
Replace Redmine selectbox with Select2 4.0.12.
$ cd /your/path/redmine
$ git clone https://github.com/farend/redmine_searchable_selectbox.git plugins/redmine_searchable_selectbox
$ # Restart redmine
2021/1/21 Transferred ownership of the repository from ishikawa999 to Far End Technologies Corporation.