keyword: refactor kwtemplater.overwrite() Make kwexpand, kwshrink restricted commands - i.e. read from filelog without expansion for substition in kwtemplater.overwrite, and set/unset restricted mode for overwrite() in in kwcommitctx and the dorecord wrapper. Preselect candidates when working on changed files (rollback, record) outside kwtemplater class, and remove 6th argument from overwrite(). Avoid duplicate substitution/search in overwrite(): Only go into restricted read mode when reading from filelog. rollback and record read from the working directory, where restricted mode would already shrink keywords before overwrite() either expands or shrinks them again. This ensures that the usual automatic operations on keywords are turned off during overwrite() and only overwrite() itself acts on them. Reduce manifest calculation to the cases where it is needed. Move helper function for expansion removal outside kwtemplater class.

revlog.addgroup(): always use _addrevision() to add new revlog entries This makes parentdelta clone support pulling.

revlog._addrevision(): allow text argument to be None, build it lazily

changegroupsubset: use readdelta() fast path when delta is against a parent

run-tests: handle .tst not ending with an LF

minirst: small code cleanup

cat: fix cat without -r, broken by 0ae35296fbf4 The default revision for revsingle() is now '.' instead of None. This preserves the behavior of cat prior to it using revsingle().

revsets: introduce revsingle helper revsingle returns a context for the last revision of the supplied revspec

revsets: make revpair revsets-aware revpair returns the first and last members of the computed revset(s)

revset: lower precedence of minus infix (issue2361)