If you attatch an image with non-ascii name such as "café.jpg" to an issue and make an attempt to display as inline image, you will fail if text formatting is Markdown.

The cause of the defect is that Markdown formatter generates escaped file name. ApplicationController#parse_inline_attachments (source:trunk/app/helpers/application_helper.rb@14003#L637) expects a file name without escaping.

Textile:

!café.jpg!   =>   

Markdown:

![](café.jpg)   =>   

Quick workaround is the following:

Index: app/helpers/application_helper.rb
===================================================================
--- app/helpers/application_helper.rb   (revision 14066)
+++ app/helpers/application_helper.rb   (working copy)
@@ -634,7 +634,7 @@
       text.gsub!(/src="([^\/"]+\.(bmp|gif|jpg|jpe|jpeg|png))"(\s+alt="([^"]*)")?/i) do |m|
         filename, ext, alt, alttext = $1.downcase, $2, $3, $4
         # search for the picture in attachments
-        if found = Attachment.latest_attach(attachments, filename)
+        if found = Attachment.latest_attach(attachments, CGI.unescape(filename))
           image_url = download_named_attachment_url(found, found.filename, :only_path => only_path)
           desc = found.description.to_s.gsub('"', '')
           if !desc.blank? && alttext.blank?