Merge branch 'issue_13463' into 'master'

Fix Side-by-side view after loading diff results

Fixes #13463

See merge request !2880

app/assets/javascripts/merge_request_tabs.js.coffee

@@ -146,6 +146,7 @@ class @MergeRequestTabs
       success: (data) =>
         document.querySelector("div#diffs").innerHTML = data.html
         $('div#diffs .js-syntax-highlight').syntaxHighlight()
+        @expandViewContainer() if @diffViewType() is 'parallel'
         @diffsLoaded = true
         @scrollToElement("#diffs")
 
@@ -177,3 +178,10 @@ class @MergeRequestTabs
     options = $.extend({}, defaults, options)
 
     $.ajax(options)
+
+  # Returns diff view type
+  diffViewType: ->
+    $('.inline-parallel-buttons a.active').data('view-type')
+
+  expandViewContainer: ->
+    $('.container-fluid').removeClass('container-limited')

app/helpers/diff_helper.rb

@@ -137,7 +137,7 @@ module DiffHelper
     # Always use HTML to handle case where JSON diff rendered this button
     params_copy.delete(:format)
 
-    link_to url_for(params_copy), id: "#{name}-diff-btn", class: (selected ? 'btn active' : 'btn') do
+    link_to url_for(params_copy), id: "#{name}-diff-btn", class: (selected ? 'btn active' : 'btn'), data: { view_type: name } do
       title
     end
   end

app/helpers/nav_helper.rb

@@ -23,6 +23,7 @@ module NavHelper
     if current_path?('merge_requests#show') ||
       current_path?('merge_requests#diffs') ||
       current_path?('merge_requests#commits') ||
+      current_path?('merge_requests#builds') ||
       current_path?('issues#show')
       if cookies[:collapsed_gutter] == 'true'
         "page-gutter right-sidebar-collapsed"