[PATCH 2/2] emacs: Prefer Content-Description over filename for part buttons

[W. Trevor King]

On Mon, Feb 03, 2014 at 12:34:18PM -0800, W. Trevor King wrote:
> On Mon, Feb 03, 2014 at 08:15:35PM +0000, Mark Walters wrote:
> > I think we should only display/use the content-description if it
> > exists and is non-empty.
> 
> Sounds good to me.  I'll queue this and a test for v2.

Rather than patching this in Emacs, maybe we should collapse the “not
set” and “set to empty string” cases in notmuch-show.c?  I can't think
of any reasons why someone would want to distinguish those two cases,
and it's easier all around if we standardize the representation as far
upstream as possible.

Thoughts?
Trevor

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