D557: show: use consistent node lengths

[yuja (Yuya Nishihara)]

yuja added inline comments.

INLINE COMMENTS

> quark wrote in show.py:428
> How about minlen=4? It could be useful in small repos.

minlen=4 seems better than 3. `_partialmatch()` falls through to
slow path if `nodelen < 4`.

REPOSITORY
  rHG Mercurial

REVISION DETAIL
  https://phab.mercurial-scm.org/D557

To: indygreg, #hg-reviewers
Cc: yuja, quark, mercurial-devel