bug#69992: Minor improvement to image map transformation logic

[Eli Zaretskii]

> Date: Sat, 30 Mar 2024 13:59:41 +0100
> From: David Ponce <da_vid@orange.fr>
> Cc: 69992@debbugs.gnu.org, joseph@breatheoutbreathe.in
> 
> Here is my last patch. The only change compared to the previous patch is that
> now the scale factor is correctly calculated based on the size of the image 
> and
> the displayed size. To minimize the performance impact, I saved a call to
> `image-size' by doing the calculation directly in the `image--compute-map' and
> `image--compute-original-map' functions. I did some benchmarks and the
> difference is not significant. The tests still give the same results :-)
> 
> Here is the new change log:

Thanks, installed on master, and closing the bug.