tests/test-convert-cvsnt-mergepoints.rlog

templater: pass (context, mapping) down to unwraphybrid()

See the subsequent patches for why.

I initially thought it would be wrong to pass a mapping to flatten() and
stringify() since these functions may be applied to a tree of generators,
where each node should be bound to the mapping when it was evaluated. But,
actually that isn't a problem. If an intermediate node has to override a
mapping dict, it can do on unwraphybrid() and yield "unwrapped" generator
of byte strings:

   "{f(g(v))}"  # literal template example.
       ^^^^     # g() want to override a mapping, so it returns a wrapped
                # object 'G{V}' with partial mapping 'lm' attached.
     ^^^^^^^    # f() stringifies 'G{V}', starting from a mapping 'm'.
                # when unwrapping 'G{}', it updates 'm' with 'lm', and
                # passes it to 'V'.

This structure is important for the formatter (and the hgweb) to build a
static template keyword, which can't access a mapping dict until evaluation
phase.

head: 1.2
branch:
locks: strict
access list:
symbolic names:
	MYBRANCH1_2: 1.1.2.2.0.2
	MYBRANCH1_1: 1.1.0.4
	MYBRANCH1: 1.1.0.2
keyword substitution: kv
total revisions: 8;	selected revisions: 8
description:
----------------------------
revision 1.2
date: 2009/04/02 07:00:32;  author: user;  state: Exp;  lines: +1 -1;  kopt: kv;  commitid: 14d449d462903487;  mergepoint: 1.1.2.2.2.1;  filename: foo.txt;
merge
----------------------------
revision 1.1
date: 2009/04/02 06:50:43;  author: user;  state: Exp;  kopt: kv;  commitid: 17ac49d460432d04;  filename: foo.txt;
branches:  1.1.2;  1.1.4;
foo.txt
----------------------------
revision 1.1.4.2
date: 2009/04/02 07:02:51;  author: user;  state: Exp;  lines: +1 -0;  kopt: kv;  commitid: 170049d4631b364d;  mergepoint: 1.1.2.2;  filename: foo.txt;
merge
----------------------------
revision 1.1.4.1
date: 2009/04/02 06:53:42;  author: user;  state: Exp;  lines: +1 -1;  kopt: kv;  commitid: dc849d460f52f49;  filename: foo.txt;
quux
----------------------------
revision 1.1.2.2
date: 2009/04/02 06:53:20;  author: user;  state: Exp;  lines: +1 -1;  kopt: kv;  commitid: 8ec49d460e02f04;  filename: foo.txt;
branches:  1.1.2.2.2;
baz
----------------------------
revision 1.1.2.1
date: 2009/04/02 06:52:38;  author: user;  state: Exp;  lines: +1 -1;  kopt: kv;  commitid: d5049d460b62e7b;  filename: foo.txt;
bar
----------------------------
revision 1.1.2.2.2.1
date: 2009/04/02 06:55:42;  author: user;  state: Exp;  lines: +1 -1;  kopt: kv;  commitid: 11c849d4616d30d1;  filename: foo.txt;
bazzie
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