1,6c1,4
< diff --git a/core/modules/media/config/install/core.entity_view_mode.media.full.yml b/core/modules/media/config/optional/core.entity_form_mode.media.add_inline.yml
< similarity index 60%
< copy from core/modules/media/config/install/core.entity_view_mode.media.full.yml
< copy to core/modules/media/config/optional/core.entity_form_mode.media.add_inline.yml
< index dfdbb3a..e082019 100644
< --- a/core/modules/media/config/install/core.entity_view_mode.media.full.yml
---
> diff --git a/core/modules/media/config/optional/core.entity_form_mode.media.add_inline.yml b/core/modules/media/config/optional/core.entity_form_mode.media.add_inline.yml
> new file mode 100644
> index 0000000000..e082019a82
> --- /dev/null
8,10c6,7
< @@ -1,9 +1,9 @@
<  langcode: en
< -status: false
---
> @@ -0,0 +1,9 @@
> +langcode: en
12,16c9,11
<  dependencies:
<    module:
<      - media
< -id: media.full
< -label: 'Full content'
---
> +dependencies:
> +  module:
> +    - media
19,20c14,15
<  targetEntityType: media
<  cache: true
---
> +targetEntityType: media
> +cache: true
27c22
< index 0000000..4a9a28b
---
> index 0000000000..4df28a8e5b
30c25
< @@ -0,0 +1,95 @@
---
> @@ -0,0 +1,79 @@
109,124d103
< +  /**
< +   * {@inheritdoc}
< +   */
< +  public static function uploadAjaxCallback(&$form, FormStateInterface &$form_state, Request $request) {
< +    // Clear our fake error.
< +    $errors = drupal_get_messages('error');
< +    $request->getSession()->getBag('flashes')->clear();
< +    foreach ($errors['error'] as $error) {
< +      if ($error !== 'Dummy inline form error') {
< +        drupal_set_message($error, 'error');
< +      }
< +    }
< +
< +    return parent::uploadAjaxCallback($form, $form_state, $request);
< +  }
< +
127c106
< index dc8e0dc..a94f4a6 100644
---
> index dc8e0dcf0f..a94f4a6b85 100644
140c119
< index 0000000..b268f6c
---
> index 0000000000..422a9e9878
143c122
< @@ -0,0 +1,238 @@
---
> @@ -0,0 +1,279 @@
256a236,241
> +      elseif (!empty($entity_form[$field_name])) {
> +        // Elements with "#required" key set will always be validated, even if
> +        // 'limit_validation_errors' is set. Disable their validation here, we
> +        // will enforce validation happens inside the real submit handler.
> +        $entity_form[$field_name] = $this->disableElementChildrenValidation($entity_form[$field_name]);
> +      }
269a255,264
> +    // If this is an image media entity, and the image field on that entity has
> +    // either "Alt field required" or "Title field required", we take care of
> +    // that in
> +    // @see \Drupal\media\Plugin\Field\FieldWidget\MediaImageWidget::process().
> +    foreach (['#alt_field_required', '#title_field_required'] as $extra_image_field_attribute) {
> +      if (!empty($entity_form[$source_field]['widget'][0][$extra_image_field_attribute])) {
> +        $entity_form[$source_field]['widget'][0][$extra_image_field_attribute] = FALSE;
> +      }
> +    }
> +
341a337,361
> +   * Bypass validation in all children of a given element.
> +   *
> +   * @param array $element
> +   *   The element array.
> +   *
> +   * @return array
> +   *   The same element array, after recursively checking all its children and
> +   *   setting "#validated" => TRUE in all required elements.
> +   */
> +  private function disableElementChildrenValidation(array $element) {
> +    foreach (Element::children($element) as $key) {
> +      if (isset($element[$key]) && $element[$key]) {
> +        $element[$key] = $this->disableElementChildrenValidation($element[$key]);
> +      }
> +    }
> +
> +    if (!empty($element['#needs_validation']) || !empty($element['#required'])) {
> +      $element['#validated'] = TRUE;
> +    }
> +
> +    return $element;
> +  }
> +
> +
> +  /**
384c404
< index 0000000..5d87cd2
---
> index 0000000000..51d3d79dbb
387c407
< @@ -0,0 +1,429 @@
---
> @@ -0,0 +1,415 @@
683,696d702
< +
< +        // Prevent the added form elements from failing the required fields
< +        // validation when the form is first processed.
< +        $element['upload_button']['#limit_validation_errors'] = [];
< +        $element['remove_button']['#limit_validation_errors'] = [];
< +        // We set a "fake" error here to prevent the form rebuilding process,
< +        // and we remove this error message later in
< +        // \Drupal\media\Element\MediaManagedFile::uploadAjaxCallback().
< +        // @TODO Fgure out a better way of doing this.
< +        $remove_operation = !empty($form_state->getUserInput()['_triggering_element_value']) && $form_state->getUserInput()['_triggering_element_value'] === 'Remove';
< +        if (\Drupal::request()->query->has(FormBuilder::AJAX_FORM_REQUEST) && !$remove_operation) {
< +          $non_existent_element = ['#parents' => []];
< +          $form_state->setError($non_existent_element, 'Dummy inline form error');
< +        }
819c825
< index 0000000..e69de29
---
> index 0000000000..e69de29bb2
822c828
< index 0000000..e69de29
---
> index 0000000000..e69de29bb2
825c831
< index 0000000..f82b523
---
> index 0000000000..9147ae0dfc
828c834
< @@ -0,0 +1,274 @@
---
> @@ -0,0 +1,276 @@
998a1005,1006
> +    // Since cardinality is -1, we should be allowed to upload another file now.
> +    $assert_session->elementExists('css', 'input[name="files[field_media_reference_1][]"]');