In pages such as Special:LonelyPages I would love to have an easy to access form which allowed filtering by namespace (à la Special:Allpages). Since MW 1.18, all $wgContentNamespaces are included in the default listing, but I think it would be nice to have some extra filtering.
I've played a bit, by adding a $namespace parameter extracted from $wgRequest->getInt( 'namespace' ), but I would need some guiding about reusing it in more Special pages (for instance, also in WantedPages) and prepare a patch if this enhancement is considered interesting enough.
Additional context
Spun out of T170687:
It would be useful on many of the pages listed above in T170687#3439746
E.g.
Special:ShortPages and Special:DeadendPages could then be used with the Help: and Project: namespace to find things to cleanup or merge
Special:LongPages could then be used with the usertalk namespace to find people to nag to archive their overwhelming talkpages.
Special:AncientPages could then be used with the Help: and Mediawiki: namespace to find things to update or reconsider the defaults.
Note: Special:Random already has this functionality, similar to solution (f) but using full namespace names, per mw:Help:Random_page e.g. full list at https://en.wikipedia.org/wiki/Wikipedia:Random
Unknowns
- Some design for how the filters should look. Tabs? A search form? A drop down? Is this covered in the UI standards spec?
- More input
