Merge branch 'fix-milestone-assign' into 'master'

Fixes issue with assign milestone not loading milestone list

cc. @jschatz1

See merge request !3346

CHANGELOG

@@ -8,6 +8,7 @@ v 8.6.1 (unreleased)
   - Fixes issue with signin button overflowing on mobile. !3342
   - Auto collapses the navigation sidebar when resizing. !3343
   - Shows error messages when trying to create label in dropdown menu. !3345
+  - Fixes issue with assign milestone not loading milestone list. !3346
 
 v 8.6.0
   - Add ability to move issue to another project

app/views/shared/issuable/_filter.html.haml

@@ -42,7 +42,7 @@
               placeholder: "Search authors", data: { first_user: (current_user.username if current_user), null_user: true, current_user: true, project_id: @project.id, field_name: "update[assignee_id]" } })
           .filter-item.inline
             = dropdown_tag("Milestone", options: { title: "Assign milestone", toggle_class: 'js-milestone-select', filter: true, dropdown_class: "dropdown-menu-selectable",
-              placeholder: "Search milestones", data: { show_no: true, field_name: "update[milestone_id]", project_id: @project.id, milestones: namespace_project_milestones_path(@project.namespace, @project, :js), use_id: true } })
+              placeholder: "Search milestones", data: { show_no: true, field_name: "update[milestone_id]", project_id: @project.id, milestones: namespace_project_milestones_path(@project.namespace, @project, :json), use_id: true } })
           = hidden_field_tag 'update[issues_ids]', []
           = hidden_field_tag :state_event, params[:state_event]
           .filter-item.inline