narrow

Emulate Emacs' narrowing feature

• Script id: 2097
• Author: Kana Natsuno
• Latest version: 0.2.1
• Release date: 2009-02-28
• Release notes:
  - Fix minor bugs:
    - |:Widen| raises an error for buffers without fold.
    - |:Narrow| doesn't hide lines smaller than 'foldminlines'.