tests/test-diff-issue2761.t

obsolete: store user name and note in UTF-8 (issue5754) (BC)

Before, user names were stored in local encoding and transferred across
repositories, which made it impossible to restore non-ASCII user names on
different platforms. This patch fixes new markers to be encoded in UTF-8
and decoded back to local encoding when displaying. Existing markers are
unfixable so they may result in mojibake.

I don't like the API that requires metadata dict to be UTF-8 encoded, which
is a source of bugs, but there's no abstraction layer to process the encoding
thingy efficiently. So we apply the same rule as extras dict to obsstore
metadata.

Test issue2761

  $ hg init

  $ touch to-be-deleted
  $ hg add
  adding to-be-deleted
  $ hg ci -m first
  $ echo a > to-be-deleted
  $ hg ci -m second
  $ rm to-be-deleted
  $ hg diff -r 0

Same issue, different code path

  $ hg up -C
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  $ touch does-not-exist-in-1
  $ hg add
  adding does-not-exist-in-1
  $ hg ci -m third
  $ rm does-not-exist-in-1
  $ hg diff -r 1