changegroup: do not delta lfs revisions There is no way to distinguish whether a delta base is LFS or non-LFS. If the delta is against LFS rawtext, and the client trying to apply it has the base revision stored as fulltext, the delta (aka. bundle) will fail to apply. This patch forbids using delta for LFS revisions in changegroup so bad deltas won't be transmitted. Note: this does not solve the problem entirely. It solves LFS delta applying to non-LFS base. But the other direction: non-LFS delta applying to LFS base is not solved yet. Differential Revision: https://phab.mercurial-scm.org/D2067

lfs: add a test showing bundle application could be broken When a bundle containing LFS delta uses non-LFS delta-base, or vice-versa, the bundle will fail to apply. Differential Revision: https://phab.mercurial-scm.org/D2066

debugwireproto: handle unimplemented util.poll() for Windows This is the same logic used in sshpeer.doublepipe. It doesn't completely fix test-ssh-proto{,-unbundle}.t ("read(-1) -> X" is changed to "read(X) -> X", the order of some lines are changed, and abort messages seem to be missing), but it cuts down a ton on the failure spew.

py3: byte-stringify test-blackbox.t

py3: byte-stringify blackbox-readonly-dispatch.py # skip-blame because just adding some b''

py3: make blackbox-readonly-dispatch.py use ui instead of print()

py3: fix int formatting of "incoming changes" log

largefiles: use %d instead of %s to process ints Differential Revision: https://phab.mercurial-scm.org/D2677

transaction: fix an error string with bytestr() on a repr()d value Fixes test-rollback.t on Python 3. Differential Revision: https://phab.mercurial-scm.org/D2674

py3: work around comparison between int and None in tagmerge