Check these three types of links:
- http://cs.wikipedia.org/wiki/Diskuse_s_wikipedistkou:Danny_B.?redirect=no
- http://cs.wikipedia.org/wiki/Wikipedista_diskuse:Danny_B.?redirect=no
- http://cs.wikipedia.org/wiki/Wikipedistka_diskuse:Danny_B.?redirect=no
- http://cs.wikipedia.org/wiki/Diskuse_s_u%C5%BEivatelem:Danny_B.?redirect=no
- http://cs.wikipedia.org/wiki/Diskuse_s_u%C5%BEivatelkou:Danny_B.?redirect=no
- http://cs.wikipedia.org/wiki/U%C5%BEivatel_diskuse:Danny_B.?redirect=no
- http://cs.wikipedia.org/wiki/U%C5%BEivatelka_diskuse:Danny_B.?redirect=no
(you can use ?action=edit or any other querystring)
The latter two types (2 - canonical name and 3 - aliases) used to redirect to the first one but they no longer do.
Same for other namespaces, e.g. ns:project:
Redirect works when no querystring is present in URL including "?" alone.
Not sure, if it's MediaWiki issue or local Wikimedia sites configuration, so putting it to MediaWiki with code-update-regression keyword.
Apparently not a regression at all.