Wikimedia Bugzilla is closed!

See also bug 8498.

Currently, the 'last' link in the history page has an URL with
  diff=nnnn&oldid=mmmm

where oldid is the rev. id of the edit in this row, and nnnn the rev. id of the
edit in the previous one.

I think there should be always 'diff=prev'. Even if someone deleted or restored
the previous revision between the time I loaded the page and now, I think I
should see the differences between the selected and its previous revision (even
if it isn't listed).

(I'm not so sure of this one.)

Thanks.