[PATCH v2] emacs: show: lazy part bugfix

[Jameson Graef Rollins]

On Wed, Sep 04 2013, Austin Clements <amdragon at MIT.EDU> wrote:
>> Now, some mime parts have subparts and to avoid overwriting the
>> sub-part data notmuch checks and if part data is already recorded it
>> does not overwrite it.
>> 
>> Now with lazy part handling this could fail: there is already part
>> data stored. In the common case it works as the part type information
>> was stored when the lazy-part button was inserted. However, this fails
>> if the lazy part has sub-parts: notmuch had no idea these existed
>> until the lazy part insertion.
>
> This says that things fail when a lazy part has sub-parts, but not
> what the failure is.  What is the failure?  Can you give a specific
> sequence of events and conditions that leads to and demonstrates the
> failure?
>
> (I ask not just for commit posterity, but because I actually don't
> know, though I may have figured it out after writing the comment
> below.)

Hey, Austin.  Here's an example of a mail that is effected the issue:

└┬╴multipart/alternative 896783 bytes
 ├─╴text/plain 379 bytes
 └┬╴multipart/related 892556 bytes
  ├─╴text/html 1236 bytes
  └─╴image/jpeg inline [photo.JPG] 890841 bytes

The multipart/related part is initially hidden.  Without Istvan's patch,
there would be no button at all for the image/jpeg part, even when the
multipart/related is exposed.  With Istvan's patch the image/jpeg button
is there, but without Mark's patch the button would actually reference
the entire multipart/alternative part, instead of just the image/jpeg.
If I tried to save the image/jpeg I would get the entire
multipart/alternative mime structure in plain text.

jamie.
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