Fix updating GraphQL boards cards on assignees update

app/assets/javascripts/boards/components/board_content_sidebar.vue

@@ -51,10 +51,6 @@ export default {
   },
   methods: {
     ...mapActions(['toggleBoardItem', 'setAssignees']),
-    updateAssignees(data) {
-      const assignees = data.issueSetAssignees?.issue?.assignees?.nodes || [];
-      this.setAssignees(assignees);
-    },
     handleClose() {
       this.toggleBoardItem({ boardItem: this.activeIssue, sidebarType: this.sidebarType });
     },
@@ -78,7 +74,7 @@ export default {
         :full-path="fullPath"
         :initial-assignees="activeIssue.assignees"
         class="assignee"
-        @assignees-updated="updateAssignees"
+        @assignees-updated="setAssignees"
       />
       <board-sidebar-epic-select class="epic" />
       <div>

changelogs/unreleased/323554-setting-updating-assignees-in-the-graphql-sidebar-doesn-t-update-b.yml

+---
+title: Fix updating GraphQL boards cards on assignees update
+merge_request: 57687
+author:
+type: fixed

spec/features/boards/sidebar_assignee_spec.rb

@@ -17,8 +17,6 @@ RSpec.describe 'Project issue boards sidebar assignee', :js do
   let(:card)              { find('.board:nth-child(2)').first('.board-card') }
 
   before do
-    stub_feature_flags(graphql_board_lists: false)
-
     project.add_maintainer(user)
 
     sign_in(user)