mart added a comment.
as far i seen, most qqc1 checkboxes around seem to have this problem REPOSITORY R119 Plasma Desktop REVISION DETAIL https://phabricator.kde.org/D5932 To: subdiff, #plasma Cc: mart, davidedmundson, plasma-devel, ZrenBot, spstarr, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, lukas