bug#15641: 24.3; [PATCH] Add find-definition for M-.

[Dmitry Gutov]

Stefan Monnier <monnier@iro.umontreal.ca> writes:

> Of course, find-tag-function should do "as little as possible": find the
> corresponding place and return it.

`lisp--company-location' looks like a decent candidate, for Elisp.

> The generic part of the code will
> take care of displaying the buffer, selecting it, remembering the
> previous position, etc... so we don't need a pop-tag-mark-function.

Should we also have a tags-loop-continue-function (or
next-file-function)? Mostly for consistency, it's not as useful in
Elisp, but it could allow the user to jump between different things with
the same name: functions, variables, faces, features.