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Maniphest T127158

mw-disambig class randomly missing on links to disambiguation pages
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Description

There are multiple reports on de.wikipedia, that the "mw-disambig" class sometimes is missing on links to disambiguation pages.

Examples:

Purging the pages does not fix it, even with "forcelinkupdate". In preview, the class sometimes is present, sometimes it is not.

Latest code changes are rEDISbc99c458cf8e: Check for array index existence and rEDIS3fad1145b598: Setting redirect to disambig as disambig

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Schnark created this task.Feb 17 2016, 8:26 AM
Schnark raised the priority of this task from to Needs Triage.
Schnark updated the task description. (Show Details)
Schnark added a project: MediaWiki-extensions-Disambiguator.
Schnark subscribed.
Restricted Application added subscribers: StudiesWorld, Aklapper. · View Herald TranscriptFeb 17 2016, 8:26 AM
Schniggendiller subscribed.Feb 17 2016, 11:02 PM
Schnark updated the task description. (Show Details)Feb 20 2016, 8:24 AM
Dalba awarded a token.Feb 27 2016, 12:02 AM
Dalba subscribed.
Dalba added a comment.EditedFeb 27 2016, 12:32 AM

This problem is also repeatedly encountered on Persian Wikipedia.

Example page (The first line of the article contains a link to a disambiguation page.)

The weird thing here is that if I delete office1 and president1 parameters from the Infobox Officeholder template then the class will be added as expected.

I tried to replicate the issue on beta wiki with the exactly the same wikitext-content, but all my tries where unsuccessful.

Dalba added a comment.EditedFeb 27 2016, 1:13 AM

I managed to narrow down the problem to a simple case.

It seems that as soon as a page is linked to a redirect page. then the link to [[احمد شفیق (ابهام‌زدایی)]] won't show up as a disambiguation.

Please see my sandbox page: https://fa.wikipedia.org/w/index.php?title=%DA%A9%D8%A7%D8%B1%D8%A8%D8%B1:Dalba/%D8%B5%D9%81%D8%AD%D9%87_%D8%AA%D9%85%D8%B1%DB%8C%D9%86&oldid=16644623

There are only 3 links, the first one is a redirect, the second one is a disambiguation page, and the third one is another disambiguation that has the issue.

When I delete the link to the redirect page, both disambiguation links will have the mw-disamb class. But when I add any redirect link again, the third disambiguation won't be marked as such.

What is so special about the third disambiguation link? I couldn't figure that out. Both of the disambiguation pages are using the same template that adds __DISAMBIG__ to them.

kaldari subscribed.Mar 27 2016, 9:37 PM

@Schnark, @Dalba: I wasn't able to reproduce this bug. Is it still happening for you? It may have been fixed by https://gerrit.wikimedia.org/r/#/c/268703/.

matmarex added subscribers: eranroz, matmarex.Mar 27 2016, 9:40 PM

Fixed by https://gerrit.wikimedia.org/r/#/c/276236/, actually.

matmarex closed this task as a duplicate of T129388: mw-disambig class doesn't appear near redirects.Mar 27 2016, 9:40 PM
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