Files named with cyrillic characters are being rejected with "The filename is too short." on Upload step.
https://commons.wikimedia.org/wiki/Commons:Help_desk#Error_uploading_images_2
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This is very similar to T154779. We "sanitize" the cyrillic and end up with a filename like "_______.jpg", which is equivalent to ".jpg", which is a bad filename. Caused by rEUWI8a6b6a49b3fe: mw.UploadWizardUpload: Actually allow overriding AbuseFilter warnings (https://gerrit.wikimedia.org/r/#/c/327263/).
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Change 331529 had a related patch set uploaded (by Bartosz Dziewoński):
mw.FormDataTransport: Don't remove Unicode characters from temp filename
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Change 331529 merged by jenkins-bot:
mw.FormDataTransport: Don't remove Unicode characters from temp filename
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Change 331531 had a related patch set uploaded (by Jforrester):
mw.FormDataTransport: Don't remove Unicode characters from temp filename
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Change 331531 merged by jenkins-bot:
mw.FormDataTransport: Don't remove Unicode characters from temp filename
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Mentioned in SAL (#wikimedia-operations) [2017-01-10T20:14:03Z] <dereckson@tin> Synchronized php-1.29.0-wmf.7/extensions/UploadWizard/resources/transports/mw.FormDataTransport.js: mw.FormDataTransport: Don't remove Unicode characters from temp filename (T155039) (duration: 00m 41s)