revset: add "diff" field to "matching" keyword The new "diff" field lets you use the matching revset keyword to find revisions that apply the same change as the selected revisions. The match must be exact (i.e. same additions, same deletions, same modified lines and same change context, same file renames and copies). Two revisions matching their diff must also match their files. Thus, to match the diff much faster we will always check that the 'files' match first, and only then check that the 'diff' matches as well.

mq: defer command wrapping to extsetup (API) mq wraps all commands that are not in commands.norepo, which is now performed in this second phase of the extensions setup process. This goes against the current best practices on the wiki [1] as far as where command wrapping is performed, but follows it regarding where global options are injected. mq needs to be the first layer called when command dispatching in order to consistently retarget to the patch repo, regardless of the load order of the extensions. This means being the last to wrap the command table. Previously, 'hg <extdiff> --mq' would diff the main repo unless mq was enabled after extdiff. [1] http://mercurial.selenic.com/wiki/WritingExtensions

revset: ensure we are reversing a list (issue3530)