There are a couple of outdated dropdowns which are used to select users. The outdated [\~/users_select/index.js](https://gitlab.com/gitlab-org/gitlab/-/blob/63a22bbc64b882b4c24625e8cd02ca9f985abf76/app/assets/javascripts/users_select/index.js) uses multiple different Dropdown implementations (jquery dropdown and select2) and rather than fixing it, it is probably better and easier to just move every usage to a more modern implementation. It should be possible to utilize: [\~/vue_shared/components/user_select/user_select.vue](https://gitlab.com/gitlab-org/gitlab/-/blob/63a22bbc64b882b4c24625e8cd02ca9f985abf76/app/assets/javascripts/vue_shared/components/user_select/user_select.vue). We do not have an example migration for that exact use case handy, but there is an example MR which moves from an outdated ref selector to a RefSelector Vue component: https://gitlab.com/gitlab-org/gitlab/-/merge_requests/81476 If you hit any wall, or the user_select.vue component doesn't cover your use-case, please reach out to `@leipert` and the Foundations team.