Wikimedia Bugzilla is closed!

Minor regression with r15976 parser updates.

Input Wiki text:
=======================
[[image:RFC 000]]
=======================

HTML Output (with line breaks added, and marker for injected stuff).
=======================
<a href="/wiki/index.php?title=Special:Upload&amp;wpDestFile=RFC_000"
 class="new" title="Image:<a href="http://www.ietf.org/rfc/rfc000.txt"
class="external" 
                                   ^^^^^^^^^^^^^ = injected
title="http://www.ietf.org/rfc/rfc000.txt">RFC 000</a>">Image:
<a href="http://www.ietf.org/rfc/rfc000.txt" class="external" 
title="http://www.ietf.org/rfc/rfc000.txt">RFC 000</a></a>
=======================

Other very similar variants possible, e.g.:
=======================
[[image:ISBN PMID 000]]
=======================

All the best, Nick.