Comments for Textile text formatting (#20511).

Patch by Go MAEDA.


git-svn-id: http://svn.redmine.org/redmine/trunk@21457 e93f8b46-1217-0410-a6f0-8f06a7374b81

lib/redmine/wiki_formatting/textile/redcloth3.rb

@@ -298,6 +298,7 @@ class RedCloth3 < String
         @pre_list = []
         rip_offtags text
         no_textile text
+        remove_html_comments text
         escape_html_tags text
         # need to do this before #hard_break and #blocks
         block_textile_quotes text unless @lite_mode
@@ -1217,4 +1218,8 @@ class RedCloth3 < String
             end
         end
     end
+
+    def remove_html_comments(text)
+        text.gsub!(/<!--[\s\S]*?-->/, '')
+    end
 end