Redmine

Redmine v2.5.1

When using

{{thumbnail(filename.png)}}

in a comment, the email sent to notify related users does not show the image. The <img> source starts with /attachments.
This is because relative url is used in thumbnail macro when processing the text.

To fix this, we should use the url_for argument :only_path => false, so that the generated urls are absolute.

The fix is in the patch and we are using it confidently in our system.