Improve comment toggle button in diff

app/assets/javascripts/application.js.coffee

@@ -169,9 +169,7 @@ $ ->
 
   # Show/hide comments on diff
   $("body").on "click", ".js-toggle-diff-comments", (e) ->
-    $(@).find('i').
-      toggleClass('fa fa-chevron-down').
-      toggleClass('fa fa-chevron-up')
+    $(@).toggleClass('active')
     $(@).closest(".diff-file").find(".notes_holder").toggle()
     e.preventDefault()
 

app/views/projects/diffs/_file.html.haml

@@ -22,9 +22,8 @@
 
       .diff-btn-group
         - if blob.text?
-          = link_to '#', class: 'js-toggle-diff-comments btn btn-sm' do
-            %i.fa.fa-chevron-down
-            Show/Hide comments
+          = link_to '#', class: 'js-toggle-diff-comments btn btn-sm active' do
+            %i.fa.fa-comments
            
 
         - if @merge_request && @merge_request.source_project