Fix unable to expand or collapse files in merge request by clicking caret

app/assets/javascripts/vue_shared/components/icon.vue

@@ -61,7 +61,7 @@ export default {
 </script>
 
 <template>
-  <svg :class="[iconSizeClass, iconTestClass]" aria-hidden="true">
+  <svg :class="[iconSizeClass, iconTestClass]" aria-hidden="true" v-on="$listeners">
     <use v-bind="{ 'xlink:href': spriteHref }" />
   </svg>
 </template>

changelogs/unreleased/25188-unable-to-expand-collapse-files-in-merge-request-by-clicking-caret.yml

+---
+title: Fix unable to expand or collapse files in merge request by clicking caret
+merge_request: 19222
+author: Brian T
+type: fixed

spec/javascripts/vue_shared/components/icon_spec.js

 import Vue from 'vue';
 import Icon from '~/vue_shared/components/icon.vue';
 import mountComponent from 'spec/helpers/vue_mount_component_helper';
+import { mount } from '@vue/test-utils';
 
 describe('Sprite Icon Component', function() {
   describe('Initialization', function() {
@@ -57,4 +58,16 @@ describe('Sprite Icon Component', function() {
       expect(Icon.props.name.validator('commit')).toBe(true);
     });
   });
+
+  it('should call registered listeners when they are triggered', () => {
+    const clickHandler = jasmine.createSpy('clickHandler');
+    const wrapper = mount(Icon, {
+      propsData: { name: 'commit' },
+      listeners: { click: clickHandler },
+    });
+
+    wrapper.find('svg').trigger('click');
+
+    expect(clickHandler).toHaveBeenCalled();
+  });
 });