Quickly expand macros for easy reading/checking.
expando.el provides a simple tool for expanding macros into a different
window so they can be quickly and easily checked and read.
NOTE: This code makes use of
elisp--preceding-sexp from elisp-mode.
This is, obviously, considered to be an "internal" function. Which is a bit
of shame really as it's a very handy thing that I think we'd normally want
to be doing in elisp, when doing elisp-oriented things. So, rather than
reinvent the wheel, I'll risk calling an internal and worry later when
things get broken.