Issue #3515876 by mably: Make this module compatible with Image Crop Widget and others

Closes #3515876

src/Plugin/Field/FieldWidget/SvgImageWidget.php

@@ -50,11 +50,11 @@ class SvgImageWidget extends ImageWidget {
   }
 
   /**
-   * {@inheritdoc}
+   * Build preview for image widget.
+   *
+   * Used by svg_image_field_widget_single_element_form_alter hook.
    */
-  public static function process($element, FormStateInterface $form_state, $form) {
-    $element = parent::process($element, $form_state, $form);
-
+  public static function processElement($element, FormStateInterface $form_state, $form) {
     // Add the image preview.
     if (!empty($element['#files']) && $element['#preview_image_style']) {
       // Override image preview if SVG file.
@@ -70,10 +70,17 @@ class SvgImageWidget extends ImageWidget {
         $element['preview'] = static::buildSvgPreview($file);
       }
     }
-
     return $element;
   }
 
+  /**
+   * {@inheritdoc}
+   */
+  public static function process($element, FormStateInterface $form_state, $form) {
+    $element = parent::process($element, $form_state, $form);
+    return static::processElement($element, $form_state, $form);
+  }
+
   /**
    * Builds the SVG file preview.
    *