Show thumbnails on documents (#22941).

git-svn-id: http://svn.redmine.org/redmine/trunk@15605 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/views/documents/show.html.erb

@@ -25,7 +25,7 @@
 </div>
 
 <h3><%= l(:label_attachment_plural) %></h3>
-<%= link_to_attachments @document %>
+<%= link_to_attachments @document, :thumbnails => true %>
 
 <% if authorize_for('documents', 'add_attachment') %>
 <p><%= link_to l(:label_attachment_new), {}, :onclick => "$('#add_attachment_form').show(); return false;",