On Tue, Mar 18, 2014 at 9:00 PM, Richard Stallman <rms@gnu.org> wrote:

A quick peek+edit in a #include in C, or "use My::Module" in Perl (where
you can say `perldoc -l My::Module' to find the module file), etc. would
be handy.

We already have such features, but they display the other file in
another buffer. Why is it useful to put them in one buffer?

What does it look like, to have multiple files in one buffer?

One possibility, which may not be optimal but which does have

the distinct advantage of already being implemented, is Magnar

Sveen's multifiles.el[0] library, inspired by this[1] question.

Incidentally, I've often wished for the inverse functionality,

i.e. the ability to conveniently partition a file-visiting buffer into a

set of indirect buffers, which could then have different major

modes, buffer-local variable values, minor modes, etc. Maybe

someone will tell me that this, too, already exists :)

[0] https://github.com/magnars/multifiles.el

[1] http://www.reddit.com/r/emacs/comments/10gc9u/can_i_have_multiple_parts_of_buffers_in_one_super/

Josh