Shrink on diff view

Shrinks when navigating to diff view.
Shrinks when refreshing on diff view.
Expandable at anytime.

app/assets/javascripts/application.js.coffee

@@ -225,6 +225,16 @@ $ ->
         if $gutterIcon.hasClass('fa-angle-double-right')
           $gutterIcon.closest('a').trigger('click')
 
+  $(document)
+    .off 'shown.bs.tab', '.merge-request-tabs a[data-toggle="tab"]'
+    .on 'shown.bs.tab', '.merge-request-tabs a[data-toggle="tab"]', (e) ->
+      action = $(e.target).attr("data-action")
+      if action is 'diffs' 
+        $gutterIcon = $('.gutter-toggle').find('i')
+        if $gutterIcon.hasClass('fa-angle-double-right')
+          $gutterIcon.closest('a').trigger('click')
+
+
   $(document)
     .off 'click', 'aside .gutter-toggle'
     .on 'click', 'aside .gutter-toggle', (e) ->

app/helpers/nav_helper.rb

@@ -3,6 +3,20 @@ module NavHelper
     cookies[:collapsed_nav] == 'true'
   end
 
+  def sidebar_gutter_collapsed_class
+    if current_path?('merge_requests#diffs') || 
+      cookies[:collapsed_gutter] == 'true'
+      "right-sidebar-collapsed"
+    else
+      "right-sidebar-expanded"
+    end
+  end
+
+  def sidebar_gutter_collapsed?
+    current_path?('merge_requests#diffs') || 
+      cookies[:collapsed_gutter] == 'true'
+  end
+
   def nav_sidebar_class
     if nav_menu_collapsed?
       "sidebar-collapsed"
@@ -29,6 +43,8 @@ module NavHelper
       else
         "page-gutter right-sidebar-expanded"
       end
+    elsif current_path?('merge_requests#diffs')
+      "page-gutter right-sidebar-collapsed"
     end
   end