Fix #3472: Configurable option to encode spaces in dropdowns

framework/helpers/BaseHtml.php

@@ -1553,7 +1553,8 @@ class BaseHtml
         $options = isset($tagOptions['options']) ? $tagOptions['options'] : [];
         $groups = isset($tagOptions['groups']) ? $tagOptions['groups'] : [];
         unset($tagOptions['prompt'], $tagOptions['options'], $tagOptions['groups']);
-
+        $options['encodeSpaces'] = ArrayHelper::getValue($options, 'encodeSpaces', $encodeSpaces);
+        
         foreach ($items as $key => $value) {
             if (is_array($value)) {
                 $groupAttrs = isset($groups[$key]) ? $groups[$key] : [];