Updated based on Ruby feedback

app/helpers/projects_helper.rb

@@ -66,10 +66,10 @@ module ProjectsHelper
       end
 
     project_link = link_to simple_sanitize(project.name), project_path(project), { class: "project-item-select-holder" }
-    project_link += icon "chevron-down", class: "dropdown-toggle-caret js-projects-dropdown-toggle", data: { target: ".header-content", toggle: "dropdown" }  if current_user
+    project_link << icon("chevron-down", class: "dropdown-toggle-caret js-projects-dropdown-toggle", data: { target: ".js-dropdown-menu-projects", toggle: "dropdown" }) if current_user
 
     full_title = namespace_link + ' / ' + project_link
-    full_title += ' &middot; '.html_safe + link_to(simple_sanitize(name), url) if name
+    full_title << ' &middot; '.html_safe + link_to(simple_sanitize(name), url) if name
 
     full_title
   end

app/views/layouts/project.html.haml

@@ -18,6 +18,7 @@
   = render "layouts/init_auto_complete" if current_user
 
 - content_for :header_content do
+  .js-dropdown-menu-projects
     .dropdown-menu.dropdown-select.dropdown-menu-projects
       = dropdown_title("Go to a project")
       = dropdown_filter("Search your projects")

spec/javascripts/fixtures/project_title.html.haml

@@ -5,6 +5,7 @@
     %a.project-item-select-holder{href: "/gitlab-org/gitlab-test"}
       GitLab Test
     %i.fa.chevron-down.dropdown-toggle-caret.js-projects-dropdown-toggle{ "data-toggle" => "dropdown", "data-target" => ".header-content" }
+  .js-dropdown-menu-projects
     .dropdown-menu.dropdown-select.dropdown-menu-projects
       .dropdown-title
         %span Go to a project