This obsoletes the WIP patch at

     id:20230903114215.60583-1-david@tethera.net

The main changes are breaking the patch up into more managable pieces,
and only saving redisplay data for images.

I am more or less satisfied with the performance impact of this
change. I ran the following test before and after and didn't see a
noticable impact in memory use (in fact it seemed to go down in some
cases, which is a mystery to me).

(profiler-start 'mem)
(notmuch-show "mimetype:image and date:2023")
(profiler-stop)
(profiler-report)

More scientific testing or personal experience welcome. And of course
I'd like to know if this breaks, the code I'm modifying is fairly
complex and has accreted over a decade or so.


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