[PATCH] dagop: make stopdepth in _genrevancestors() match revset arg

[Yuya Nishihara]

On Fri, 23 Jun 2017 11:39:37 -0700, Martin von Zweigbergk wrote:
> # HG changeset patch
> # User Martin von Zweigbergk <martinvonz at google.com>
> # Date 1498241757 25200
> #      Fri Jun 23 11:15:57 2017 -0700
> # Node ID ba913ce1b38584554a62ba3d765d124c284e7e0d
> # Parent  f63d111258dab8375322483888a44bf9be6c4673
> dagop: make stopdepth in _genrevancestors() match revset arg
> 
> I was confused for a while that stopdepth was exclusive in dagop.py
> but not in the ancestors() revset.

We generally use half-open range for internal stuff (e.g. revlog.revs(),
smartset.spanset), so I made stopdepth an exclusive boundary.

> Let's also raise an exception if stopdepth<0, since revset.py already
> checks that.

This seems good.