https://bugzilla.wikimedia.org/show_bug.cgi?id=52062

       Web browser: ---
            Bug ID: 52062
           Summary: AbuseFilter variable "new_wikitext" invalid for edits
                    made from the mobile version
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: AbuseFilter
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected]
    Classification: Unclassified
   Mobile Platform: ---

For some edits (I am almost sure that it is only edits are made from the mobile
version, i.e. http://<lang_code>.m.wikipedia.org/), the abusefilter variable
"new_wikitext" contains only the text of the edited section, while
"old_wikitext" contains the full text of the article. As a consequence, there
are currently many false positives for filters that trigger on large deletions.

For exemple, the following entry in the log of
http://en.wikipedia.org/wiki/Special:AbuseFilter/30 ("Large deletion from
article by new editors") shows a huge deletion:
https://en.wikipedia.org/wiki/Special:AbuseLog/9044770

However, there is no deletion in the actual diff (which is incorrectly tagged
with "Tag: blanking"):
https://en.wikipedia.org/w/index.php?title=Kkangpae&diff=prev&oldid=565689194

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