"attachment:filename" link syntax would not work if the file name contains "@"
A file name which contains "@" is treated as email address.
Probably all versions that support "attachment:filename" syntax are affected. redmine.org is also affected. Please see this example: attachment:email@example.com
<a class="attachment" href="/firstname.lastname@example.org">email@example.com</a>
attachment:<a class="email" href="mailto:firstname.lastname@example.org">email@example.com</a>
#6 Updated by Marius BALTEANU 11 days ago
Updated the patch to work with the latest changes from #26443.