[PATCH (topgit) 2/2] tg-patch: fix pagination

Previously, when I was invoking `tg patch` the following used to happen:

1. .topmsg content was sent directly to _terminal_
2. for each file in the patch, its diff was generated with `git diff`
   and sent to *PAGER*
3. trailing 'tg: ...' was sent to terminal again

So the problem is that while `tg patch >file` works as expected, plain `tg patch` does not -- in pager there is only a part of the whole patch (first file diff) and header and trailer are ommitted.

I've finally decided to fix this inconvenience, and the way it works is like in git -- we just hook `setup_pager` function in commands which need to be paginated.

Signed-off-by: Kirill Smelkov <kirr@landau.phys.spbu.ru>
---
 tg-patch.sh |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)