Added dropdown to list all projects on project header

When clicking the current project name, it shows a dropdown menu with a list of all projects for that group or user

app/assets/stylesheets/framework/header.scss

@@ -73,7 +73,6 @@ header {
 
     .title {
       margin: 0;
-      overflow: hidden;
       font-size: 19px;
       line-height: $header-height;
       font-weight: normal;
@@ -88,6 +87,27 @@ header {
           text-decoration: underline;
         }
       }
+
+      .dropdown {
+        display: inline-block;
+      }
+
+      .dropdown-toggle-caret {
+        margin-left: 5px;
+      }
+
+      .dropdown-item {
+        &.active {
+          .dropdown-link {
+            color: #fff;
+          }
+        }
+
+        .dropdown-link:hover {
+          color: #fff;
+          text-decoration: none;
+        }
+      }
     }
 
     .navbar-collapse {

app/helpers/projects_helper.rb

@@ -45,6 +45,7 @@ module ProjectsHelper
   end
 
   def project_title(project, name = nil, url = nil)
+    project_id = project.id
     namespace_link =
       if project.group
         link_to(simple_sanitize(project.group.name), group_path(project.group))
@@ -53,14 +54,34 @@ module ProjectsHelper
         link_to(simple_sanitize(owner.name), user_path(owner))
       end
 
-    project_link = link_to(simple_sanitize(project.name), project_path(project))
+    all_projects =
+      if project.group
+        project.group.projects
+      else
+        PersonalProjectsFinder.new(project.namespace.owner).execute(current_user)
+      end
+
+    project_link = content_tag :div, {class: "dropdown"} do
+      output = content_tag :a, {class: "dropdown-toggle", href: "#", data: {toggle: "dropdown"}} do
+        btnOutput = simple_sanitize(project.name)
+        btnOutput += content_tag :span, nil, {class: "caret dropdown-toggle-caret"}
+      end
+
+      list = all_projects.map do |project|
+        content_tag :li, {class: "dropdown-item #{"active" if project_id == project.id}"} do
+          link_to(simple_sanitize(project.name), project_path(project), {class: "dropdown-link"})
+        end
+      end
+
+      output += content_tag :ul, {class: "dropdown-menu"} do
+        list.join.html_safe
+      end
+    end
 
     full_title = namespace_link + ' / ' + project_link
     full_title += ' · '.html_safe + link_to(simple_sanitize(name), url) if name
 
-    content_tag :span do
-      full_title
-    end
+    full_title
   end
 
   def remove_project_message(project)