This was caused by updating to 1.12.1 then. This needs changes even from 1.11 to 1.12 migration https://jqueryui.com/upgrade-guide/1.12/ I have asked upstream help https://gitlab.com/gitlab-org/gitlab-ce/issues/25302 Please give a heads up to maintainers of reverse dependencies before updating to a newer version next time. When many maintainers do this breaking updates without consulting maintainers of reverse dependencies (update of jquery to version 3 broke diaspora), it is seriously demotivating to maintain large packages like gitlab and diaspora. There will be many to break but not many to help fix. It took years of work to bring these packages to their current state and having to fix these issues at the last moment of a release is not fun.
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