Issue #2656990 by k4v: Fixed File Entity Browser Widget has no schema

Author: k4v

config/schema/file_entity.schema.yml

@@ -119,3 +119,23 @@ action.configuration.file_temporary_action:
 field.widget.settings.file_editable:
   type: field.widget.settings.file_generic
   label: 'File format settings'
+
+field.widget.settings.file_entity_browser:
+  type: mapping
+  label: 'File entity browser settings'
+  mapping:
+    entity_browser:
+      type: string
+      label: 'Entity browser'
+    field_widget_edit:
+      type: boolean
+      label: 'Display edit button'
+    field_widget_remove:
+      type: boolean
+      label: 'Display remove button'
+    open:
+      type: boolean
+      label: 'Show widget details as open by default'
+    view_mode:
+      type: string
+      label: 'View mode'

src/Plugin/Field/FieldWidget/FileEntityBrowser.php

@@ -45,6 +45,11 @@ class FileEntityBrowser extends EntityReference {
    */
   public static function defaultSettings() {
     $settings = parent::defaultSettings();
+
+    // These settings are hidden.
+    unset($settings['field_widget_display']);
+    unset($settings['field_widget_display_settings']);
+
     $settings['view_mode'] = 'thumbnail';
     return $settings;
   }