Merge branch 'labels-placement' into 'master'

Move Labels and Milestones as sub tab to Issues/MR

## What does this MR do?

UI/UX change. Moves project labels and milestone tabs under Issues and Merge request tabs. 

## Why was this MR needed?

To solve problem of having to many tabs in top navigation. Since Labels and Milestones depends on Issue/MR feature it belongs to it and can be removed from top nav.

## What are the relevant issue numbers?

Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18368

## Does this MR meet the acceptance criteria?

- [x] [CHANGELOG](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CHANGELOG) entry added
- [x] [Documentation created/updated](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/doc/development/doc_styleguide.md) - not needed
- [x] API support added - not needed
- [x] Tests
  - [x] Added for this feature/bug - changed existing tests to match new behaviour
  - [x] All builds are passing
- [x] Conform by the [style guides](https://gitlab.com/gitlab-org/gitlab-ce/blob/master/CONTRIBUTING.md#style-guides)

cc @jschatz1 @annabeldunstone @skyruler

See merge request !4592

CHANGELOG

@@ -64,6 +64,7 @@ v 8.9.0 (unreleased)
   - Toggling a task list item in a issue/mr description does not creates a Todo for mentions
   - Improved UX of date pickers on issue & milestone forms
   - Cache on the database if a project has an active external issue tracker.
+  - Put project Labels and Milestones pages links under Issues and Merge Requests tabs as subnav
 
 v 8.8.5 (unreleased)
   - Ensure branch cleanup regardless of whether the GitHub import process succeeds

app/views/layouts/nav/_project.html.haml

@@ -62,15 +62,8 @@
           %span
             Graphs
 
-    - if project_nav_tab? :milestones
-      = nav_link(controller: :milestones) do
-        = link_to namespace_project_milestones_path(@project.namespace, @project), title: 'Milestones' do
-          = navbar_icon('milestones')
-          %span
-            Milestones
-
     - if project_nav_tab? :issues
-      = nav_link(controller: :issues) do
+      = nav_link(controller: [:issues, :labels, :milestones]) do
         = link_to url_for_project_issues(@project, only_path: true), title: 'Issues', class: 'shortcuts-issues' do
           = navbar_icon('issues')
           %span
@@ -86,13 +79,6 @@
             Merge Requests
             %span.badge.count.merge_counter= number_with_delimiter(@project.merge_requests.opened.count)
 
-    - if project_nav_tab? :labels
-      = nav_link(controller: :labels) do
-        = link_to namespace_project_labels_path(@project.namespace, @project), title: 'Labels' do
-          = icon('tags fw')
-          %span
-            Labels
-
     - if project_nav_tab? :wiki
       = nav_link(controller: :wikis) do
         = link_to get_project_wiki_path(@project), title: 'Wiki', class: 'shortcuts-wiki' do

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

@@ -0,0 +1,25 @@
+%ul.nav-links.sub-nav
+  %div{ class: (container_class) }
+    - if project_nav_tab?(:issues) && !current_controller?(:merge_requests)
+      = nav_link(controller: :issues) do
+        = link_to url_for_project_issues(@project, only_path: true), title: 'Issues' do
+          %span
+            Issues
+
+    - if project_nav_tab?(:merge_requests) && current_controller?(:merge_requests)
+      = nav_link(controller: :merge_requests) do
+        = link_to namespace_project_merge_requests_path(@project.namespace, @project), title: 'Merge Requests' do
+          %span
+            Merge Requests
+
+    - if project_nav_tab? :labels
+      = nav_link(controller: :labels) do
+        = link_to namespace_project_labels_path(@project.namespace, @project), title: 'Labels' do
+          %span
+            Labels
+
+    - if project_nav_tab? :milestones
+      = nav_link(controller: :milestones) do
+        = link_to namespace_project_milestones_path(@project.namespace, @project), title: 'Milestones' do
+          %span
+            Milestones

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

@@ -1,9 +1,12 @@
+- @no_container = true
 - page_title "Issues"
+= render "projects/issues/head"
 
 = content_for :meta_tags do
   - if current_user
     = auto_discovery_link_tag(:atom, namespace_project_issues_url(@project.namespace, @project, :atom, private_token: current_user.private_token), title: "#{@project.name} issues")
 
+%div{ class: (container_class) }
   .top-area
     = render 'shared/issuable/nav', type: :issues
     .nav-controls

app/views/projects/labels/index.html.haml

@@ -1,6 +1,9 @@
+- @no_container = true
 - page_title "Labels"
 - hide_class = ''
+= render "projects/issues/head"
 
+%div{ class: (container_class) }
   .top-area
     .nav-text
       Labels can be applied to issues and merge requests.

app/views/projects/merge_requests/_head.html.haml

@@ -1,5 +0,0 @@
-.top-tabs
-  = link_to namespace_project_merge_requests_path(@project.namespace, @project), class: "tab #{'active' if current_page?(namespace_project_merge_requests_path(@project.namespace, @project)) }" do
-    %span
-    Merge Requests
-

app/views/projects/merge_requests/index.html.haml

@@ -1,7 +1,9 @@
+- @no_container = true
 - page_title "Merge Requests"
-
+= render "projects/issues/head"
 = render 'projects/last_push'
 
+%div{ class: (container_class) }
   .top-area
     = render 'shared/issuable/nav', type: :merge_requests
     .nav-controls

app/views/projects/milestones/index.html.haml

@@ -1,5 +1,8 @@
+- @no_container = true
 - page_title "Milestones"
+= render "projects/issues/head"
 
+%div{ class: (container_class) }
   .top-area
     = render 'shared/milestones_filter'
 

features/project/active_tab.feature

@@ -107,12 +107,16 @@ Feature: Project Active Tab
 
   Scenario: On Project Issues/Milestones
     Given I visit my project's issues page
-    And I click the "Milestones" tab
-    Then the active main tab should be Milestones
+    And I click the "Milestones" sub tab
+    Then the active main tab should be Issues
+    Then the active sub tab should be Milestones
     And no other main tabs should be active
+    And no other sub tabs should be active
 
   Scenario: On Project Issues/Labels
     Given I visit my project's issues page
-    And I click the "Labels" tab
-    Then the active main tab should be Labels
+    And I click the "Labels" sub tab
+    Then the active main tab should be Issues
+    Then the active sub tab should be Labels
     And no other main tabs should be active
+    And no other sub tabs should be active

features/steps/project/active_tab.rb

@@ -77,14 +77,14 @@ class Spinach::Features::ProjectActiveTab < Spinach::FeatureSteps
 
   # Sub Tabs: Issues
 
-  step 'I click the "Milestones" tab' do
-    page.within('.layout-nav') do
+  step 'I click the "Milestones" sub tab' do
+    page.within('.sub-nav') do
       click_link('Milestones')
     end
   end
 
-  step 'I click the "Labels" tab' do
-    page.within('.layout-nav') do
+  step 'I click the "Labels" sub tab' do
+    page.within('.sub-nav') do
       click_link('Labels')
     end
   end
@@ -93,11 +93,11 @@ class Spinach::Features::ProjectActiveTab < Spinach::FeatureSteps
     ensure_active_sub_tab('Issues')
   end
 
-  step 'the active main tab should be Milestones' do
-    ensure_active_main_tab('Milestones')
+  step 'the active sub tab should be Milestones' do
+    ensure_active_sub_tab('Milestones')
   end
 
-  step 'the active main tab should be Labels' do
-    ensure_active_main_tab('Labels')
+  step 'the active sub tab should be Labels' do
+    ensure_active_sub_tab('Labels')
   end
 end

features/steps/shared/active_tab.rb

@@ -6,7 +6,7 @@ module SharedActiveTab
   end
 
   def ensure_active_sub_tab(content)
-    expect(find('div.content ul.nav-links li.active')).to have_content(content)
+    expect(find('.sub-nav li.active')).to have_content(content)
   end
 
   def ensure_active_sub_nav(content)
@@ -18,7 +18,7 @@ module SharedActiveTab
   end
 
   step 'no other sub tabs should be active' do
-    expect(page).to have_selector('div.content ul.nav-links li.active', count: 1)
+    expect(page).to have_selector('.sub-nav li.active', count: 1)
   end
 
   step 'no other sub navs should be active' do