tests/test-rebuildstate.t

summary: make "incoming" information sensitive to branch in URL (issue3830)

Before this patch, "incoming" information of "hg summary --remote" is
not sensitive to the branch specified in the URL of the destination
repository, even though "hg pull"/"hg incoming" are so.

Invocation of "discovery.findcommonincoming()" without "heads"
argument treats revisions on branches other than the one specified in
the URL as incoming ones unexpectedly.

This patch looks head revisions, which are already detected by
"hg.addbranchrevs()" from URL, up against "other" repository, and
invokes "discovery.findcommonincoming()" with list of them as "heads"
to limit calculation of incoming revisions.

basic test for hg debugrebuildstate

  $ hg init repo
  $ cd repo

  $ touch foo bar
  $ hg ci -Am 'add foo bar'
  adding bar
  adding foo

  $ touch baz
  $ hg add baz
  $ hg rm bar

  $ hg debugrebuildstate

state dump after

  $ hg debugstate --nodates | sort
  n 644         -1 bar
  n 644         -1 foo

status

  $ hg st -A
  ! bar
  ? baz
  C foo

  $ cd ..