[PATCH STABLE] log --follow shouldn't depend on the working dir context

[Matt Mackall]

On Mon, 2012-06-11 at 22:39 +0200, Christian Boos wrote:
> Hello,
> 
> I noticed that the change 60101427d618 (released in Mercurial 2.1.1)
> introduced a check for "log --follow", verifying that the file examined
> is present in the parent context, so that revisions in the filelog
> can be followed from the appropriate starting point.
> 
> See http://www.selenic.com/hg/rev/60101427d618 for details.
> 
> This is all well and good except for the change's notion of parent
> context: it uses the working dir context for that!

Imprecise: it uses the '.' context, which is wctx.p1().

Which is probably wrong, even here. 'hg log --follow file' wants to
consult wctx, not wctx.p1()!

How '--follow' relates to '-r <not a single rev>' is pretty well into
undefined territory though. Not poking at the dirstate is probably
appropriate whenever -r is given though.

-- 
Mathematics is the supreme nostalgia of our time.