Displays thumbnails of attached images of the issue view (#1006).

This behaviour can be turned on/off in Settings -> Display (off by default). Thumbnail size can be configured there too.

git-svn-id: svn+ssh://rubyforge.org/var/svn/redmine/trunk@9933 e93f8b46-1217-0410-a6f0-8f06a7374b81

app/helpers/application_helper.rb

@@ -153,6 +153,12 @@ module ApplicationHelper
     end
   end
 
+  def thumbnail_tag(attachment)
+    link_to image_tag(url_for(:controller => 'attachments', :action => 'thumbnail', :id => attachment)),
+      {:controller => 'attachments', :action => 'show', :id => attachment, :filename => attachment.filename},
+      :title => attachment.filename
+  end
+
   def toggle_link(name, id, options={})
     onclick = "Element.toggle('#{id}'); "
     onclick << (options[:focus] ? "Form.Element.focus('#{options[:focus]}'); " : "this.blur(); ")