"original message" replies shouldn't be hidden by default

[Daniel Kahn Gillmor]

hey y'all--

i use notmuch-emacs, and i'm noticing an fair number of respondents
trying to do interleaved responses with MUAs that do the whole
"-----Original Message-----" silliness.

As a result, notmuch-show displays the entire message as something like:


 [ 69-line hidden original message. Click/Enter to show. ]

Seems like notmuch-show could be cleverer.  how about something like
this:

 * if the entire displayed MIME part appears to be nothing but
   whitespace and a "original message", then don't auto-collapse it.

Alternately:

 * if the entire displayed MIME part appears to be nothing but
   whitespace and a "original message" then don't treat it as an
   "original message" at all, but apply the normal part-guessing and
   collapsing logic to the internal content of the "original message"

any thoughts?

   --dkg