openproject/frontend/app/templates/work_packages/activities/_entry.html

<div ng-switch="activityType">
  <revision-activity work-package="workPackage"
                 activity="activity"
                 activity-no="activityNo"
                 ng-switch-when="Revision">
  </revision-activity>
  <user-activity work-package="workPackage"
            activity="activity"
            activity-no="activityNo"
            is-initial="isInitial"
            autocomplete-path="{{ autocompletePath }}"
            input-element-id="'add-comment-text'"
            ng-switch-default>
  </user-activity>
</div>