https://bugzilla.wikimedia.org/show_bug.cgi?id=27446
Summary: U+200B ZERO WIDTH SPACE allowed in page titles
Product: MediaWiki
Version: wikimedia-deployment
Platform: All
OS/Version: All
Status: NEW
Severity: normal
Priority: Normal
Component: General/Unknown
AssignedTo: [email protected]
ReportedBy: [email protected]
Blocks: 3969
Related bugs: #3969 Unicode tracking; #14600, #5732; #2593, #1524 (regarding
usernames)
A bug in the pywikipedia framework [1] showed up when editing interwikis. This
caused bot wars [2], which have been fixed by removing the U+200B ZERO WIDTH
SPACE from end of the page title where the problems happened [3].
Should this character be allowed in page titles? And, more specifically, at the
end of a page title?
Characters from the range U+2000-U+200A are already treated as spaces (and
replaced by underscores). Since Unicode 4.0, U+200B is no longer considered
whitespace by the Unicode Consortium.
To cite Brion Vibber in #14600:
> They're not technically illegal, but perhaps should be excluded as they
> wouldn't be useful.
and in #1524:
> *Invalid* characters (those that are illegal in XML or don't reliably cut and
> paste) need to be outright blocked in titles.
Although U+200B ZERO WIDTH SPACE seems to cut-and-paste on windows, it's not
something I'd call 'reliable' - selecting characters from the left, moving to
the right, it's easy enough not to select the U+200B ZERO WIDTH SPACE at the
end of the page title. As such, I think it's reasonable not to allow the
character, or to replace it with an underscore.
[1]
https://sourceforge.net/tracker/?func=detail&atid=603138&aid=3182761&group_id=93107
[2] http://en.wikipedia.org/w/index.php?title=Podolsk&action=history
[3]
http://bo.wikipedia.org/w/index.php?title=%E0%BD%94%E0%BD%BC%E0%BC%8B%E0%BD%91%E0%BD%BC%E0%BD%A3%E0%BC%8B%E0%BD%A6%E0%BD%B2%E0%BD%82&action=history
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