Fixed #12681

Author: brandonkelly

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Release Notes for Craft CMS 3.x
 
+## Unreleased
+
+- Fixed a bug where clicking on the scrollbar of a disclosure menu would close it. ([#12681](https://github.com/craftcms/cms/issues/12681))
+
 ## 3.7.66 - 2023-02-14
 
 - HTML Purifier now allows `oembed` tags. ([ckeditor#59](https://github.com/craftcms/ckeditor/issues/59))

src/web/assets/garnish/dist/garnish.js

@@ -118,6 +118,7 @@ export default Base.extend(
       var newTarget = event.target;
       var triggerButton = $(newTarget).closest('[data-disclosure-trigger]');
       var newTargetIsInsideDisclosure =
+        this.$container[0] === event.target ||
         this.$container.has(newTarget).length > 0;
 
       // If click target matches trigger element or disclosure child, do nothing