bug#25287: 25.1; [WISH] shr-rescale-image: pass window size externally

[Lars Ingebrigtsen]

Christophe Troestler <Christophe.Troestler@umons.ac.be> writes:

>> Couldn't mu4e just switch to the correct buffer first and then the
>> scaling would work automatically?
>
> The author (added to CC) seems to imply that it is hard
> <https://github.com/djcb/mu/issues/984>.  Maybe the problem is that
> this buffer contains many parts, each with its own rendering.

OK, I have to objection to adding an optional target-width/target-height
pair of parameters to `shr-rescale-image'.

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   bloggy blog: http://lars.ingebrigtsen.no