Item12640: don't screw up filenames

Calling

$fileName = Foswiki::Sandbox::untaint($fileName, \&Foswiki::Sandbox::validateAttachmentName);

will rewrite the fileName in a rather unexpected way: it removes all suspicious characters - like a space. Uploading it to foswiki these chars not passing the {NameFilter} as configured in LocalSite.cfg will be rewritten using underscores. Not so Foswiki::Sandbox::validateAttachmentName ... which renders it useless for xsendfile (and viewfile actually too).

-- MichaelDaum - 06 Nov 2013

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