--- macros.rb   2016-05-25 13:05:15.013450140 +0200
+++ macros.rb  2016-05-25 13:03:03.841450140 +0200
@@ -222,7 +222,7 @@
         show_label = args[0] || l(:button_show)
         hide_label = args[1] || args[0] || l(:button_hide)
         js = "$('##{html_id}-show, ##{html_id}-hide').toggle(); $('##{html_id}').fadeToggle(150);"
-        out = ''.html_safe
+        out = text.html_safe
         out << link_to_function(show_label, js, :id => "#{html_id}-show", :class => 'collapsible collapsed')
         out << link_to_function(hide_label, js, :id => "#{html_id}-hide", :class => 'collapsible', :style => 'display:none;')
         out << content_tag('div', textilizable(text, :object => obj, :headings => false), :id => html_id, :class => 'collapsed-text', :style => 'display:none;')