Make reaction popup transparent when necessary instead of hiding it so the…

Authored by alessandro on Feb 10 2020, 7:39 AM.

Description

Make reaction popup transparent when necessary instead of hiding it so the layout doesn't change when it's shown

Reviewers: kfunk, mlaurent, nicolasfella, dfaure

Reviewed By: kfunk

Differential Revision: https://phabricator.kde.org/D27249