We are talking on frwiki about how to list subpages (https://fr.wikipedia.org/wiki/Discussion_Projet:JavaScript/Rapport_de_bug/Archive_1#MediaWiki:Gadget-SousPages.js).
We looked how action=info do and found there is a bug:
You can create a subpage of "User:Foo" called "User:Foo_/_bar" (see for example https://fr.wikipedia.org/wiki/Special:PrefixIndex/Utilisateur:Polmars).
But the link provided by action=info to list subpages is "Special:PrefixIndex/User:Foo/", which don’t list "User:Foo_/_bar".
Furthermore, these subpages are not counted in action=info. In this example, there are 94 subpages, but only 49 without space ; action=info says 49 subpages.
Version: 1.22.0
Severity: minor