Expose Issue ID

app/views/projects/issues/_issue.html.haml

-%li{ id: dom_id(issue), class: issue_css_classes(issue), url: issue_path(issue), :'data-labels' => label_ids(issue) }
+%li{ id: dom_id(issue), class: issue_css_classes(issue), url: issue_path(issue), data: { labels: label_ids(issue), id: issue.id } }
   - if controller.controller_name == 'issues' && can?(current_user, :admin_issue, @project)
     .issue-check
       = check_box_tag dom_id(issue,"selected"), nil, false, 'data-id' => issue.id, class: "selected_issue"