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Unexpected Category sort on French Wiktionary
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Description

From https://www.mediawiki.org/wiki/Topic:So5yno6j2ak27ees:

On the French Wiktionary, I notice occasional odd sort glitches. For instance, http://fr.wiktionary.org/w/index.php?title=Cat%C3%A9gorie:Noms_communs&subcatfrom=bok%0ANoms+communs+en+bok#mw-subcategories will show "Noms communs en bokobaru‎", "Noms communs en boko‎", "Noms communs en bokyi‎" despite the fact that the first two sub-categories are indexed with Catégorie:Noms communs|bokobaru‏‎ and Catégorie:Noms communs|boko, respectively. The few times this happens, it is always the case that the out-of-sequence sort key is a prolongation of the key it should go after.
Another particularly bad example is http://fr.wiktionary.org/w/index.php?title=Cat%C3%A9gorie:Noms_communs&subcatfrom=dan%0ANoms+communs+en+dan#mw-subcategories where we have danaru‎, dangaléat, dani de l’Ouest, dani de Mid Grand Valley, danois, dano, and only then dan (so we have dan moved down six slots, and dano moved down one slot).

Event Timeline

MarkAHershberger raised the priority of this task from to Needs Triage.
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Aklapper renamed this task from Odd sort problems on frwiki to Unexpected Category sort on French Wiktionary.Sep 3 2015, 12:10 PM
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No, this can't be related to T88088, frwiktionary is not using an UCA collation.

matmarex closed this task as Invalid.Mar 9 2016, 10:46 PM

The category sort keys on the affected pages have invisible Unicode control characters at the end ('LEFT-TO-RIGHT MARK' (U+200E) or 'RIGHT-TO-LEFT MARK' (U+200F) or both). This affects the ordering, as expected when using the 'uppercase' collation. Removing them will fix the problem. I did it with a few pages: https://fr.wiktionary.org/wiki/Spécial:Contributions/Matma_Rex and both of the examples given are now ordered correctly.

Here's the list of potentially affected 6081 pages (based on the latest dump), if anyone wants to run a bot to fix them: