anchor.diff:        <% if purpose == 'clicker' %>
           <%= f.hidden_field :types, value: ['Question'] %>
         <% end %>
  -      <% if purpose == 'media' %>
  -        <div class="custom-control custom-checkbox mb-2">
  -          <%= f.check_box :all_types,
  -                          id: 'search_all_media_types',
  -                          class: 'custom-control-input',
  -                          checked: true,
  -                          data: { id: 'search_media_types'} %>
  -          <%= f.label :all_media_types,
  -                      t('basics.all'),
  -                      { class: 'custom-control-label' } %>
  -        </div>
  -      <% else %>
  -        <%= f.hidden_field :all_types, value: '0' %>
  -      <% end %>
  +      <div class="custom-control custom-checkbox mb-2">
  +        <%= f.check_box :all_types,
  +                        id: 'search_all_media_types',
  +                        class: 'custom-control-input',
  +                        checked: purpose.in?(['media', 'clicker']),
  +                        data: { id: 'search_media_types'} %>
  +        <%= f.label :all_media_types,
  +                    t('basics.all'),
  +                    { class: 'custom-control-label' } %>
  +      </div>
       </div>
       <div class="col-6 col-lg-3 form-group">
         <%= f.label :teachable_ids, t('basics.associated_to') %>
  
positive.code:                    { id: 'search_media_editor_ids',
                       multiple: true,
                       class: 'selectize',
                       disabled: true } %>
        <div class="custom-control custom-checkbox mb-2">
          <%= f.check_box :all_editors,
                          id: 'search_all_media_editors',
  
negative.code:       <%= helpdesk(t('admin.medium.info.search_tags'), true) %>
        <%= f.select :tag_ids,
                     options_for_select([[]]),
                     { prompt: t('basics.select')},
                     { multiple: true,
                       class: 'selectize',
                       style: 'display: none;',
                       disabled: true,
                       required: true,
                       data: { filled: false,
                               ajax: true,
                               model: 'tag',
  