[notmuch] wish: more informative citations

[David Bremner]

Wouldn't it be nice if citations showed the first line or so of the text
being cited?

Stealing text from another thread, 

 > In case of a citation following immediately new contents. When the citation
 > was collapsed:
 > 
 >     [1-line citation. Click/Enter to show.]
 > Lorem ipsum dolor sit amet, consectetur adipisicin

Would be displayed as something like:

> In case of a citation following [ Click/Enter to show 3 more lines ]

Actually I'm not too sure about the format, but I thought I'd through
that out there.

Happy hacking,

David