tests/test-diff-newlines.t

bookmarks: issue a warning if remote doesn't support comparing bookmarks

We want to issue a warning and abort comparing bookmarks if remote doesn't
support it. Otherwise hg out -B will list you outgoing bookmarks that cannot
be pushed to the remote repository using hg push -B.

  $ hg init

  $ python -c 'print "confuse str.splitlines\nembedded\rnewline"' > a
  $ hg ci -Ama -d '1 0'
  adding a

  $ echo clean diff >> a
  $ hg ci -mb -d '2 0'

  $ hg diff -r0 -r1
  diff -r 107ba6f817b5 -r 310ce7989cdc a
  --- a/a	Thu Jan 01 00:00:01 1970 +0000
  +++ b/a	Thu Jan 01 00:00:02 1970 +0000
  @@ -1,2 +1,3 @@
   confuse str.splitlines
   embedded\rnewline (esc)
  +clean diff