Wikimedia Bugzilla is closed!

This URL had me confused for a while:

http://en.wikipedia.org/w/index.php?title=Khety_II&diff=266098037

* Title parameter is "Khety II"
* Title shown on the page is "Khety II"
* HTML title attribute is "Khety II"
* Both revisions in the diff are from the page "Khety II"
* Both "Revision as of" titles link to old versions of "Khety II"
* Both "edit" links next to the revision titles link to old versions of "Khety II"

BUT

* "Next edit" and "Previous edit" links put "Ninth dynasty of Egypt" in the title (though lead to other edits to Khety II)
* Article, discussion, edit, history, move and watch tabs all link to "Ninth dynasty of Egypt"
* Diff says "8 intermediate revisions not shown" when there are no intermediate revisions

It is clearly broken behaviour for "article", "discussion", etc. tabs to link to a page other than that shown in the page title, and also broken behaviour for them to link to a page that is not the page either of the revisions being compared belongs to.

The unexpected intrusion of links to [[Ninth dynasty of Egypt]] here is presumably because that's where the current version of [[Khety II]] redirects to. Compare an identical URL with "redirect=no" appended:

http://en.wikipedia.org/w/index.php?title=Khety_II&diff=266098037&redirect=no

Now everything links to the right place.

So, diffs should behave as though "redirect=no" was supplied even if it wasn't.