[PATCH 3 of 3] template: Change extras to use showlist rather than manual templ call

[Matthew Turk]

# HG changeset patch
# User Matthew Turk <matthewturk at gmail.com>
# Date 1384555377 18000
#      Fri Nov 15 17:42:57 2013 -0500
# Node ID 47549382f99bd0b753f8ce7d787050d32f4890f5
# Parent  b78c4813b053fd84eaf19b0df289d96d67e25b48
template: Change extras to use showlist rather than manual templ call.

This enables start_extras and end_extras in template maps.

diff -r b78c4813b053 -r 47549382f99b mercurial/templatekw.py
--- a/mercurial/templatekw.py	Fri Nov 15 17:14:02 2013 -0500
+++ b/mercurial/templatekw.py	Fri Nov 15 17:42:57 2013 -0500
@@ -221,11 +221,8 @@
 def showextras(**args):
     """:extras: List of dicts with key, value entries of the 'extras'
     field of this changeset."""
-    templ = args['templ']
-    for key, value in sorted(args['ctx'].extra().items()):
-        args = args.copy()
-        args.update(dict(key=key, value=value))
-        yield templ('extra', **args)
+    yield showlist('extra', sorted(dict(key=a, value=b)
+                   for (a, b) in args['ctx'].extra().items()), **args)
 
 def showfileadds(**args):
     """:file_adds: List of strings. Files added by this changeset."""