comparison tests/test-evolve-topic.t @ 3362:92b414710d2e stable

prev: jump to parent's successor if parent is obsolete and topic is involved

`hg stack` shows a linear chain of commits even when they are not linear chain
and some changesets are obsoleted and have successors as separate head. This is
very nice to have a post evolution view of the stack. However when `hg prev` is
run on an unstable changeset whose parent is obsolete and does not topic but
parents successor has the topic, it shows no parent on the topic.

This patch makes `hg prev` update to parent's successor and make things follow
the stack order.

3361:1439021d22f9

  t2$ add ggg (current unstable)
  t1: add fff
  t0^ add eee (base)

  $ hg prev
  no parent in topic "bar"
  (do you want --no-topic)
  [1]

3362:92b414710d2e

  t2$ add ggg (current unstable)
  t1: add fff
  t0^ add eee (base)

  $ hg prev
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved
  [18] add fff