tests/test-issue619.t

largefiles: wrap "rebase.rebase" for functions using it directly

Before this patch, largefiles extension wraps only "rebase" in the
command table by "extensions.wrapcommand". But there are some
functions using "rebase.rebase" directly.

Without special care for them, largefiles extension can't work
correctly with such functions. In addition to it, "special care" often
becomes complicated and awkward. For example:

  - "unshelve" can't get correct result of "rebase.rebase", because of
    lack of special care

  - special care for "hg pull --rebase" causes issue3861

This patch wraps "rebase.rebase" for functions using it directly.

For simplicity, this patch keeps 'special care for "hg pull --rebase"'.
It is removed in the subsequent patch.

http://mercurial.selenic.com/bts/issue619

  $ hg init
  $ echo a > a
  $ hg ci -Ama
  adding a

  $ echo b > b
  $ hg branch b
  marked working directory as branch b
  (branches are permanent and global, did you want a bookmark?)
  $ hg ci -Amb
  adding b

  $ hg co -C 0
  0 files updated, 0 files merged, 1 files removed, 0 files unresolved

Fast-forward:

  $ hg merge b
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved
  (branch merge, don't forget to commit)
  $ hg ci -Ammerge

Bogus fast-forward should fail:

  $ hg merge b
  abort: merging with a working directory ancestor has no effect
  [255]