Resolve #3024039 "Carousel item wrapper"

Closes #3024039

src/Plugin/views/style/ViewsBootstrapCarousel.php

@@ -50,6 +50,7 @@ class ViewsBootstrapCarousel extends StylePluginBase {
     $options['wrap'] = ['default' => TRUE];
     $options['effect'] = ['default' => 'slide'];
     $options['use_caption'] = ['default' => TRUE];
+    $options['carousel_item_classes'] = ['default' => ''];
     $options['columns'] = ['default' => 1];
     $options['breakpoints'] = ['default' => 'md'];
 
@@ -143,6 +144,13 @@ class ViewsBootstrapCarousel extends StylePluginBase {
       '#default_value' => $this->options['effect'],
     ];
 
+    $form['carousel_item_classes'] = [
+      '#type' => 'textfield',
+      '#title' => $this->t('Carousel Item classes'),
+      '#description' => $this->t('Additionaly classes to add to divs with class carousel-item.'),
+      '#default_value' => $this->options['carousel_item_classes'],
+    ];
+
     $form['columns'] = [
       '#type' => 'select',
       '#title' => $this->t('Columns'),