Wikimedia Bugzilla is closed!

The unified diff field in the details of an abuse filter hit are not unified.
It shows all the previous page text with a "-" in front of it, followed by all the new wikitext (including any and all unchanged lines) with a "+" in front of it.

This causes false positives in filters looking for patterns in the "added_lines" field.

As example:
http://commons.wikimedia.org/wiki/Special:AbuseLog/121696

For those not able to view that hit (due to rights):
It triggered filter 74 which has the following one-liner as "Condition"

   ("{{http://" in lcase(added_lines))


The diff generated by MediaWIki itself in the edit made is as following:

   |Author=[[User:流雨创意工作室|流雨创意工作室]]    |Author=[[User:流雨创意工作室|流雨创意工作室]]
   |Date=2010-11-12    |Date=2010-11-12
-   |Permission={{OTRS pending}}
+   |Permission={{subst:OP}}
   |other_versions=   |other_versions=
   }}  }}

So the only thing changed is a template in the Permissions-field.
AbuseFilter's "edit_diff

@@ -1,14 +1,14 @@
-== Summary ==
-{{Information
-|Description={{zh|1=....！}}
-|Source={{http://foo.bar.com}}
-|Author=[[User:JohnDoe]]
-|Date=2010-11-12
-|Permission={{OTRS pending}}
-|other_versions=
-}}
-
-== Licensing ==
+== Summary ==
+{{Information
+|Description={{zh|1=....！}}
+|Source={{http://foo.bar.com}}
+|Author=[[User:JohnDoe]]
+|Date=2010-11-12
+|Permission={{subst:OP}}
+|other_versions=
+}}
+
+== Licensing ==
(values of the Information-template replaced with samples)


Lines added in edit (AbuseFilter: added_lines)
== Summary ==
{{Information
|Description={{zh|1=....！}}
|Source={{http://foo.bar.com}}
|Author=[[User:JohnDoe]]
|Date=2010-11-12
|Permission={{subst:OP}}
|other_versions=
}}

== Licensing ==


--
Krinkle