bug#69602: 29.1; Image :map should adjust with :scale and :rotation

[Joseph Turner]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Joseph Turner <joseph@breatheoutbreathe.in>
>> Cc: 69602@debbugs.gnu.org, stephen.berman@gmx.net, juri@linkov.net
>> Date: Fri, 08 Mar 2024 00:39:16 -0800
>>
>> > Are we sure no Lisp program out there would want the coordinates in
>> > :map to remain unchanged under these transformation?  Maybe we should
>> > add a variable to control this, so that the change could be truly
>> > backward-compatible?
>>
>> Good point.  Thanks!
>>
>> What if explicitly passing :unscaled-map 'no-recalculate in
>> `create-image' prevented :map from being recalculated later?
>
> I think that's less desirable, since some images could be created
> outside of control of a Lisp program that wants to control the
> coordinates.
>
>> If not, what kind of variable did you have in mind?  A special variable
>> let-bound the call?  Or another argument to `create-image'?
>
> I had in mind a special variable (we'd need to mention it in NEWS and
> in the doc string of the relevant functions).  Adding an argument is a
> heavier change, and I think it is not justified in this case, because
> I do agree with you that most, if not all, applications would want the
> coordinates to scale together with the image.

Thanks for your feedback and your patience!

Please see attached patch.

Joseph

0001-Recompute-map-when-image-scale-rotation-or-flip-chan.patch
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