Show sub-nav under Merge Requests when issue tracker is non-default

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

@@ -23,7 +23,7 @@
             Registry
 
     - if project_nav_tab? :issues
-      = nav_link(controller: [:issues, :labels, :milestones, :boards]) do
+      = nav_link(controller: @project.default_issues_tracker? ? [:issues, :labels, :milestones, :boards] : :issues) do
         = link_to namespace_project_issues_path(@project.namespace, @project), title: 'Issues', class: 'shortcuts-issues' do
           %span
             Issues
@@ -31,7 +31,7 @@
               %span.badge.count.issue_counter= number_with_delimiter(IssuesFinder.new(current_user, project_id: @project.id).execute.opened.count)
 
     - if project_nav_tab? :merge_requests
-      = nav_link(controller: :merge_requests) do
+      = nav_link(controller: @project.default_issues_tracker? ? :merge_requests : [:merge_requests, :labels, :milestones]) do
         = link_to namespace_project_merge_requests_path(@project.namespace, @project), title: 'Merge Requests', class: 'shortcuts-merge_requests' do
           %span
             Merge Requests

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

 - @no_container = true
 - page_title "Edit", @label.name, "Labels"
-= render "projects/issues/head"
+= render "shared/mr_head"
 
 %div{ class: container_class }
   %h3.page-title

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

 - @no_container = true
 - page_title "Labels"
 - hide_class = ''
-= render "projects/issues/head"
+= render "shared/mr_head"
 
 - if @labels.exists? || @prioritized_labels.exists?
   %div{ class: container_class }

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

 - @no_container = true
 - page_title "New Label"
-= render "projects/issues/head"
+= render "shared/mr_head"
 
 %div{ class: container_class }
   %h3.page-title

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

+= content_for :sub_nav do
+  .scrolling-tabs-container.sub-nav-scroll
+    = render 'shared/nav_scroll'
+    .nav-links.sub-nav.scrolling-tabs
+      %ul{ class: (container_class) }
+        = nav_link(controller: :merge_requests) do
+          = link_to namespace_project_merge_requests_path(@project.namespace, @project), title: 'Merge Requests' do
+            %span
+              List
+
+        - 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/merge_requests/index.html.haml

@@ -2,6 +2,9 @@
 - @bulk_edit = can?(current_user, :admin_merge_request, @project)
 
 - page_title "Merge Requests"
+- unless @project.default_issues_tracker?
+  = content_for :sub_nav do
+    = render "projects/merge_requests/head"
 = render 'projects/last_push'
 
 - content_for :page_specific_javascripts do

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

 - @no_container = true
 - page_title "Edit", @milestone.title, "Milestones"
-= render "projects/issues/head"
+= render "shared/mr_head"
 
 %div{ class: container_class }
 

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

 - @no_container = true
 - page_title 'Milestones'
-= render 'projects/issues/head'
+= render "shared/mr_head"
 
 %div{ class: container_class }
   .top-area

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

 - @no_container = true
 - page_title "New Milestone"
-= render "projects/issues/head"
+= render "shared/mr_head"
 
 %div{ class: container_class }
   %h3.page-title

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

 - @no_container = true
 - page_title       @milestone.title, "Milestones"
 - page_description @milestone.description
-= render "projects/issues/head"
+= render "shared/mr_head"
 
 %div{ class: container_class }
   .detail-page-header.milestone-page-header

app/views/shared/_mr_head.html.haml

+- if @project.default_issues_tracker?
+  = render "projects/issues/head"
+- else
+  = render "projects/merge_requests/head"

changelogs/unreleased/30779-show-mr-subnav-issue-tracker.yml

+---
+title: Show sub-nav under Merge Requests when issue tracker is non-default.
+merge_request: 10658
+author: