state: support validated declaration of nested unfinished ops
This enables extensions to define commands that delgate to rebase, evolve, etc. one or more times to also have their own unfinished states for the full sequence of operations without monkey-patching _unfinishedstates.
Differential Revision: https://phab.mercurial-scm.org/D8714
absorb: improve message for the case when changeset became empty
In changeset
f55099982bc5, I introduced the message "became empty and became
...", which I was never very happy with. Raphaël Gomès suggested "became empty
as ...". That sounds much nicer.
Differential Revision: https://phab.mercurial-scm.org/D8765
merge: document return values of manifestmerge() and calculateupdates()
In future patches, I want to add one more return value which represents
information which needs to stored and used at commit time.
Differential Revision: https://phab.mercurial-scm.org/D8741