openproject/frontend/app/templates/work_packages/watchers/lookup.html

<div class="work-package--watchers-lookup">
  <form data-ng-submit="addWatcher()" class="form">
    <div class="form--field">
      <div class="form--field-container">
        <div class="form--text-field-container">
          <angucomplete-alt
            id="watchers-lookup"
            placeholder="Type to add users"
            pause="100"
            selected-object="selectedWatcher"
            search-fields="name"
            local-data="watchers"
            title-field="name"
            image-field="avatar"
            minlength="2"
            input-class="form--text-field"
            disable-input="locked" />
        </div>
      </div>
    </div>
  </form>
</div>