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app/controllers/notes_controller.rb

@@ -52,7 +52,7 @@ class NotesController < ApplicationController
              when "merge_request"
                then project.merge_requests.find(params[:target_id]).notes.inc_author.order("created_at DESC").limit(20)
              when "wiki"
-               then project.wikis.find(params[:target_id]).notes.order("created_at DESC").limit(20)
+               then project.wikis.reverse.map {|w| w.notes.fresh }.flatten[0..20]
              end
     @notes = if params[:last_id]