0.6.2, Firefox 66.0.4, Chrome 74.0.3729.157: Return key doesn't work in the cooccurrence query field

0.6.2, Firefox 66.0.4, Chrome 74.0.3729.157: Return key doesn’t work in the cooccurrence query field

(from redmine: issue id 2583, created on 2019/05/21 by Sebastien Jacquot)