magnars/multifiles.el — pull request #4 by Fuco1 (2013-06-15 21:15:21+00:00)
Title: Add C-u prefix to `mf/save-original-buffers` to select the buffer

Without prefix, the mirrors go by default to `*multifile*`, otherwise you can `read-buffer` into which the mirror goes. I've found it super cool to pull parts of buffers into different "default" buffer with code. Imagine pulling a bit of utility.c into main.c, then narrowing... bloody genius!