wireprotov2: teach changesetdata to fetch ancestors until depth...
wireprotov2: teach changesetdata to fetch ancestors until depth
For shallow clone, it is useful to specify a starting node and tell
the server to send up to N ancestors from that starting point. This
enables the server to perform the DAG walk without the client having
to discover the base/stop node(s) first.
This commit implements support for said queries on the changesetdata
command.
Differential Revision:
https://phab.mercurial-scm.org/D4621
