bug#70093: *** SPAM *** bug#70093: Remove unnecessary `image-tests--map-equal'

[David Ponce via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

On 30/03/2024 20:44, Joseph Turner wrote:
> With the resolution of bug#69992, it may be possible to remove the
> `image-tests--map-equal' equality predicate from lisp/image-tests.el.
> 
> Eli and David, would you please apply the attached patch and then run
> the tests to see if we still need to allow for tolerances in
> `image--compute-map-and-original-map'?
> 
> The tests pass for me, but then again, they never failed on my machine...
> 
> Thank you!! I'm grateful for this fun collaboration. :)
> 
> Joseph
> 
> 

Hi Joseph,

Did you forget to attach the patch? I cannot find it.

Anyway, I don't think the resolution of bug#69992 changed anything
regarding the test `image--compute-map-and-original-map'.  And to
be honest I don't understand why it gives a different result on our
configurations.

To test, I also eval the following simple code in *scratch* buffer,
which gives me consistent results on my laptop:

(let* ((svg (svg-create 200 100))
        (omap `(((rect . ((0 . 0) . (50 . 50)))
                 rect-test (help-echo "rect-test"))
                ((circle . ((85 . 55) . 25))
                 circle-test (help-echo "circle-test"))
                ((poly . [100 0 125 0 170 50 125 50])
                 poly-test (help-echo "poly-test")))))
   (svg-rectangle svg 0 0 50 50
                  :stroke-width 0 :fill "red")
   (svg-circle    svg 85 55 25
                  :stroke-width 0 :fill "green")
   (svg-polyline  svg '((100 . 0) (125 . 0) (170 . 50) (125 . 50))
                  :stroke-width 0 :fill "blue")
   (let ((image (svg-image svg
                           :original-map omap
                           :scale nil    ;; vary scale test
                           :rotation nil ;; vary rotation test
                           :flip nil     ;; vary flip test
                           )))
     ;; Must see the pointer and help-echo change when mouse hovers the
     ;; rect, circle and poly hot spots.
     (insert-image image)
     (insert ?\n)
     ;; Must see the same original map.
     (image--compute-original-map image)))

Thanks!