test-dirstate-race: back out changeset c82fa7efcbc8 This is non-deterministic. In any case, I switched to using debugrebuilddirstate in my WIP patches, which makes this moot.

revset: fix order of first/last members in compound expression (BC) Suppose len(subset) >> len(ls) in common cases, 'subset & ls' should be avoided whenever possible.

revset: filter first/last members by __and__ operation This replaces 'if y in subset' with '& subset'. first(null) and last(wdir()) are fixed thanks to fullreposet.__and__. This also revealed that first() and last() don't follow the order of the input set. 'ls & subset' is valid only if the ordering requirement is 'define' or 'any'. No performance regression observed: revset #0: limit(0:9999, 100, 9000) 0) 0.001164 1) 0.001135 revset #2: 9000 & limit(0:9999, 100, 9000) 0) 0.001224 1) 0.001181 revset #3: last(0:9999, 100) 0) 0.000237 1) 0.000199

revset: reject negative number to select first/last n members Negative 'lim' doesn't make sense here, and it makes things complicated when using list[:lim].

revset: fix order of last() n members where n > 1 (BC) last() is implemented using a reversed iterator, so the result should be reversed again. I've marked this as BC since it's quite old bug seen in 3.0. The first bad revision is 4849f574aa24 "revset: changed last implementation to use lazy classes."

debugrevspec: add option to suppress list of computed revisions Test will be added later.