patch: fix patchmeta/hunk synchronization in iterhunks() Synchronizing on bfile does not work on file removal where bfile is /dev/null. We match items on afile or bfile instead. The incorrect code makes iterhunks() to emit patchmeta and hunks separately in some cases. This is currently hidden by applydiff() being too tolerant when processing patchmeta, and will be fixed later.

patch: remove unnecessary exists() call in selectfile()

import: deprecate --base This option was a convenient hack introduced in Mercurial early days which unfortunately survived until now.

patch: remove redundant islink() call

extensions: update doc of enabled() and disabled() according to d5b525697ddb

localrepo: add savecommitmessage() to write last-message.txt

memctx: simplify constructor

scmutil: improve path calculation for install-relative RC files (issue2841) This code was ugly and might do the wrong thing with symlinks.