Issue #3444558: Editor setting form not showing in text format manage page

Closes #3444558

src/Plugin/Editor/Quill.php

@@ -37,7 +37,10 @@ class Quill extends EditorBase {
   /**
    * {@inheritdoc}
    */
-  public function settingsForm(array $form, FormStateInterface $form_state, Editor $editor) {
+  public function buildConfigurationForm(array $form, FormStateInterface $form_state) {
+    $editor = $form_state->get('editor');
+    assert($editor instanceof Editor);
+
     $settings = $editor->getSettings();
 
     $form['placeholder'] = [