cmdutil: changeset_printer: use methods of filectx/changectx.
This allows extensions that modify changeset metadata (e.g.
description) by overriding methods of changectx to get consistent
behavior from all log-like commands, regardless of whether templates
or styles are used. Without this, overriding changectx methods works
if you use styles or templates, but not with default log format.
This meant adding filectx.extra() for consistency with changectx.
#!/bin/sh
hg init repo
cd repo
echo a > a
hg ci -qAm 'add a'
echo b > b
hg ci -qAm 'add b'
hg up -qC 0
hg rm a
hg ci -m 'rm a'
hg up -qC 1
rm a
echo '% local deleted a file, remote removed'
hg merge # should fail, since there are deleted files
hg -v merge --force
echo % should show a as removed
hg st
hg ci -m merge
echo % manifest. should not have a:
hg manifest