tests/test-diff-issue2761.t

merge with stable

There were a handful of merge conflicts in the wire protocol code due
to significant refactoring in default. When resolving the conflicts,
I tried to produce the minimal number of changes to make the incoming
security patches work with the new code.

I will send some follow-up commits to get the security patches better
integrated into default.

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