[5.x] Page children as value for field conditions (#11368)

Author: heidkaemper

src/Http/Controllers/CP/Collections/ExtractsFromEntryFields.php

@@ -43,6 +43,7 @@ protected function extractFromFields($entry, $blueprint)
 
         $extraValues = [
             'depth' => $entry->page()?->depth(),
+            'children' => $entry->page()?->flattenedPages()->pluck('id')->all(),
         ];
 
         return [$values->all(), $fields->meta(), $extraValues];