keyword: handle resolve to either parent

Merged files are considered modified at commit time even if only 1 parent
differs. In this case we must use the change context of this parent for
expansion.

The issue went unnoticed for long because it is only apparent until the next
update to the merge revision - except in test-keyword where it was always
staring us in the face.

hgext/keyword.py

@@ -264,8 +264,17 b' class kwtemplater(object):'
             if util.binary(data):
                 continue
             if expand:
+                parents = ctx.parents()
                 if lookup:
                     ctx = self.linkctx(f, mf[f])
+                elif self.restrict and len(parents) > 1:
+                    # merge commit
+                    # in case of conflict f is in modified state during
+                    # merge, even if f does not differ from f in parent
+                    for p in parents:
+                        if f in p and not p[f].cmp(ctx[f]):
+                            ctx = p[f].changectx()
+                            break
                 data, found = self.substitute(data, f, ctx, re_kw.subn)
             elif self.restrict:
                 found = re_kw.search(data)

tests/test-keyword.t

@@ -1062,13 +1062,13 b' conflict: keyword should stay outside co'
   foo
   >>>>>>> other: 85d2d2d732a5  - test: simplemerge
 
-resolve to local
+resolve to local, m must contain hash of last change (local parent)
 
   $ hg resolve -t internal:local -a
   (no more unresolved files)
   $ hg commit -m localresolve
   $ cat m
-  $Id: m 800511b3a22d Thu, 01 Jan 1970 00:00:00 +0000 test $
+  $Id: m 88a80c8d172e Thu, 01 Jan 1970 00:00:00 +0000 test $
   bar
 
 Test restricted mode with transplant -b