Issue #3213379 by kaszarobert, idebr, MaxPah, Dennis Cohn, anneke_vde,...

Issue #3213379 by kaszarobert, idebr, MaxPah, Dennis Cohn, anneke_vde, michaellander, tvalimaa, mjpa, Daniel Korte, DieterHolvoet, akz, Martijn de Wit, vistree, useernamee, steveoriol, weseze: WebP images are not regenerated when using image_widget_crop

imageapi_optimize_webp.module

 <?php
 
+use Drupal\Core\File\Exception\FileException;
+
 /**
  * Implements hook_entity_type_alter().
  */
@@ -8,4 +10,22 @@ function imageapi_optimize_webp_entity_type_alter(array &$entity_types) {
     $entity_types['imageapi_optimize_pipeline']->setClass('Drupal\imageapi_optimize_webp\Entity\ImageAPIOptimizeWebPPipeline');
   }
   return [];
-}
\ No newline at end of file
+}
+
+/**
+ * Implements hook_image_style_flush().
+ */
+function imageapi_optimize_webp_image_style_flush($style, $path = NULL) {
+  if ($path !== NULL && substr_compare($path, '.webp', -strlen('.webp')) !== 0) {
+    $file_system = \Drupal::service('file_system');
+    $derivative_uri = $style->buildUri($path . '.webp');
+    if (file_exists($derivative_uri)) {
+      try {
+        $file_system->delete($derivative_uri);
+      }
+      catch (FileException $e) {
+        // Ignore failed deletes.
+      }
+    }
+  }
+}