bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images

bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images

[Rah Guzar via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Dear Emacs maintainers,
  Starting from `emacs -Q`, post the following code into scratch buffer,

```
(let* ((image (create-image path-to-png 'png nil :mask 'heuristic))
       (rows (max 1 (1- (cdr (image-size image))))))
  (goto-char (point-max))
  (insert "\n")
  (insert-sliced-image image " " nil rows))
```
This inserts the image specified at the end of the buffer. The image
has a `keymap` text property which include binding for various
operations on images but moving point to the image and trying to use
any of these (e.g. `i +` to increase image size) results in the error,

Error running timer ‘image--change-size’: (error "No image under point")

Rah Guzar


In GNU Emacs 29.0.60 (build 1, x86_64-suse-linux-gnu, GTK+ Version
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bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images

[Eli Zaretskii]

> Date: Wed, 05 Apr 2023 17:23:11 +0200
> From:  Rah Guzar via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> (let* ((image (create-image path-to-png 'png nil :mask 'heuristic))
>        (rows (max 1 (1- (cdr (image-size image))))))
>   (goto-char (point-max))
>   (insert "\n")
>   (insert-sliced-image image " " nil rows))
> ```
> This inserts the image specified at the end of the buffer. The image
> has a `keymap` text property which include binding for various
> operations on images but moving point to the image and trying to use
> any of these (e.g. `i +` to increase image size) results in the error,
> 
> Error running timer ‘image--change-size’: (error "No image under point")

This should be fixed now on the emacs-29 branch.

It isn't perfect: "i -" leaves display artifacts (which I think are
unrelated to this bug report per se), and "i r" doesn't really work,
except when you type 'r' 4 times in a row.  But I'm not sure I
understand the conceptual meaning of rotating a sliced image, and even
resizing it doesn't necessarily have a clear-cut meaning IMO.

Perhaps we should decide we don't support these operations for sliced
images, and simply show a different error message specifically about
that non-support?

Lars, any comments and/or ideas?

bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images

[Rah Guzar via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hi Eli,
  I can confirm that the issue is mostly fixed now. One thing I noticed
  was that it is still possible to trigger the error by starting with my
  recipe before, moving the point to somewhere on the image and then
  using right arrow key. Since the image has a single column the point
  is now off image but on the same line. This buffer position still has
  the "image-map" and pressing e.g. "i +" still causes the error.

  I also see the artifacts you mentioned with "i -". I am using
  "insert-sliced-image" to insert image of typeset math in a comint
  derived mode and I have seen visual artifacts at the end of line
  there too and like in this case "describe-char" shows them to be
  control characters. The also seem to disappear on their own if I
  switch buffer and back. I haven't been able to get rid of them and
  can't reproduce them in "emacs -Q" so I might be doing something wrong
  but this makes me think this might be the result of creating the image
  with a ":max-width" property which might cause the equivalent of "i-".

  According to the info manual, the advantage of using sliced images is
  to get a more intuitive scrolling behavior and that is the reason I am
  using them. I think for everything else the image should behave as a
  single image. For that reason the behavior of "i r" seems correct to
  me. It rotates the image and then slices. From the perspective of
  scrolling it would nicer to have slices which have a fixed length and
  width so that number of slices changes when "i +" and "i -" are used.

Thanks a lot!
Rah Guzar

Eli Zaretskii <eliz@gnu.org> writes:

>> Date: Wed, 05 Apr 2023 17:23:11 +0200
>> From:  Rah Guzar via "Bug reports for GNU Emacs,
>>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
>>
>> (let* ((image (create-image path-to-png 'png nil :mask 'heuristic))
>>        (rows (max 1 (1- (cdr (image-size image))))))
>>   (goto-char (point-max))
>>   (insert "\n")
>>   (insert-sliced-image image " " nil rows))
>> ```
>> This inserts the image specified at the end of the buffer. The image
>> has a `keymap` text property which include binding for various
>> operations on images but moving point to the image and trying to use
>> any of these (e.g. `i +` to increase image size) results in the error,
>>
>> Error running timer ‘image--change-size’: (error "No image under point")
>
> This should be fixed now on the emacs-29 branch.
>
> It isn't perfect: "i -" leaves display artifacts (which I think are
> unrelated to this bug report per se), and "i r" doesn't really work,
> except when you type 'r' 4 times in a row.  But I'm not sure I
> understand the conceptual meaning of rotating a sliced image, and even
> resizing it doesn't necessarily have a clear-cut meaning IMO.
>
> Perhaps we should decide we don't support these operations for sliced
> images, and simply show a different error message specifically about
> that non-support?
>
> Lars, any comments and/or ideas?

bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images

[Eli Zaretskii]

> From: Rah Guzar <rahguzar@zohomail.eu>
> Cc: Lars Ingebrigtsen <larsi@gnus.org>, 62679@debbugs.gnu.org
> Date: Thu, 06 Apr 2023 17:43:55 +0200
> 
> Hi Eli,
>   I can confirm that the issue is mostly fixed now. One thing I noticed
>   was that it is still possible to trigger the error by starting with my
>   recipe before, moving the point to somewhere on the image and then
>   using right arrow key. Since the image has a single column the point
>   is now off image but on the same line. This buffer position still has
>   the "image-map" and pressing e.g. "i +" still causes the error.

I cannot reproduce this.  On my system, if I move point with the right
arrow key, "M-x describe-text-properties" doesn't show the keymap
property.

>   According to the info manual, the advantage of using sliced images is
>   to get a more intuitive scrolling behavior and that is the reason I am
>   using them. I think for everything else the image should behave as a
>   single image. For that reason the behavior of "i r" seems correct to
>   me. It rotates the image and then slices.

If this is what you see, I guess you have Emacs built with
ImageMagick?  I don't see "rotation followed by slicing", because the
code doesn't do that, at least not with rotation that is implemented
natively in Emacs on my system.  But, as I said, rotation of sliced
image is not well defined, so my opinion is that people should not
depend on it doing something sensible.

bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images

[Rah Guzar via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Rah Guzar <rahguzar@zohomail.eu>
>> Cc: Lars Ingebrigtsen <larsi@gnus.org>, 62679@debbugs.gnu.org
>> Date: Thu, 06 Apr 2023 17:43:55 +0200
>>
>> Hi Eli,
>>   I can confirm that the issue is mostly fixed now. One thing I noticed
>>   was that it is still possible to trigger the error by starting with my
>>   recipe before, moving the point to somewhere on the image and then
>>   using right arrow key. Since the image has a single column the point
>>   is now off image but on the same line. This buffer position still has
>>   the "image-map" and pressing e.g. "i +" still causes the error.
>
> I cannot reproduce this.  On my system, if I move point with the right
> arrow key, "M-x describe-text-properties" doesn't show the keymap
> property.
>

You are right there is no keymap property there but somehow "image-map"
is still active. I can press "i +" there and see the error while after or
before the image pressing "i +" will insert the two characters.

>>   According to the info manual, the advantage of using sliced images is
>>   to get a more intuitive scrolling behavior and that is the reason I am
>>   using them. I think for everything else the image should behave as a
>>   single image. For that reason the behavior of "i r" seems correct to
>>   me. It rotates the image and then slices.
>
> If this is what you see, I guess you have Emacs built with
> ImageMagick?  I don't see "rotation followed by slicing", because the
> code doesn't do that, at least not with rotation that is implemented
> natively in Emacs on my system.  But, as I said, rotation of sliced
> image is not well defined, so my opinion is that people should not
> depend on it doing something sensible.

Evaluating "(image-type-available-p 'imagemagick)" returns nil so I
think Emacs is built without imagemagick support. The sequence of
command I ran to build it were
./configure --with-pgtk
make
make bootstrap
where the first make failed due to some org issue.

But to the broader point about rotation not being sensible I think it
might be a good idea to put a different keymap on sliced images in that
case. Maybe "sliced-image-map" which should be the parent of
"image-map". I don't see any misbehavior though.

bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images

[Eli Zaretskii]

> From: Rah Guzar <rahguzar@zohomail.eu>
> Cc: larsi@gnus.org, 62679@debbugs.gnu.org
> Date: Thu, 06 Apr 2023 20:30:19 +0200
> 
> > I cannot reproduce this.  On my system, if I move point with the right
> > arrow key, "M-x describe-text-properties" doesn't show the keymap
> > property.
> 
> You are right there is no keymap property there but somehow "image-map"
> is still active. I can press "i +" there and see the error while after or
> before the image pressing "i +" will insert the two characters.

Thanks, I fixed this now on the emacs-29 branch.

> >>   According to the info manual, the advantage of using sliced images is
> >>   to get a more intuitive scrolling behavior and that is the reason I am
> >>   using them. I think for everything else the image should behave as a
> >>   single image. For that reason the behavior of "i r" seems correct to
> >>   me. It rotates the image and then slices.
> >
> > If this is what you see, I guess you have Emacs built with
> > ImageMagick?  I don't see "rotation followed by slicing", because the
> > code doesn't do that, at least not with rotation that is implemented
> > natively in Emacs on my system.  But, as I said, rotation of sliced
> > image is not well defined, so my opinion is that people should not
> > depend on it doing something sensible.
> 
> Evaluating "(image-type-available-p 'imagemagick)" returns nil so I
> think Emacs is built without imagemagick support. The sequence of
> command I ran to build it were
> ./configure --with-pgtk
> make
> make bootstrap
> where the first make failed due to some org issue.
> 
> But to the broader point about rotation not being sensible I think it
> might be a good idea to put a different keymap on sliced images in that
> case. Maybe "sliced-image-map" which should be the parent of
> "image-map". I don't see any misbehavior though.

I added a new map, in which some commands that have no meaning for
sliced images are absent.

And with that, I'm closing this bug.

bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images

[Rah Guzar via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Hi Eli,
   Thanks for the changes. Everything work as expected for me now.

   However, the new keymap is only partially effective. I cannot
   use "i r" to rotate a sliced image now but it is possible to do it
   using "i + r" i.e. the mechanism that is used to allow performing
   repeated manipulations still uses a map which allows rotations.

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Rah Guzar <rahguzar@zohomail.eu>
>> Cc: larsi@gnus.org, 62679@debbugs.gnu.org
>> Date: Thu, 06 Apr 2023 20:30:19 +0200
>>
>> > I cannot reproduce this.  On my system, if I move point with the right
>> > arrow key, "M-x describe-text-properties" doesn't show the keymap
>> > property.
>>
>> You are right there is no keymap property there but somehow "image-map"
>> is still active. I can press "i +" there and see the error while after or
>> before the image pressing "i +" will insert the two characters.
>
> Thanks, I fixed this now on the emacs-29 branch.
>
>> >>   According to the info manual, the advantage of using sliced images is
>> >>   to get a more intuitive scrolling behavior and that is the reason I am
>> >>   using them. I think for everything else the image should behave as a
>> >>   single image. For that reason the behavior of "i r" seems correct to
>> >>   me. It rotates the image and then slices.
>> >
>> > If this is what you see, I guess you have Emacs built with
>> > ImageMagick?  I don't see "rotation followed by slicing", because the
>> > code doesn't do that, at least not with rotation that is implemented
>> > natively in Emacs on my system.  But, as I said, rotation of sliced
>> > image is not well defined, so my opinion is that people should not
>> > depend on it doing something sensible.
>>
>> Evaluating "(image-type-available-p 'imagemagick)" returns nil so I
>> think Emacs is built without imagemagick support. The sequence of
>> command I ran to build it were
>> ./configure --with-pgtk
>> make
>> make bootstrap
>> where the first make failed due to some org issue.
>>
>> But to the broader point about rotation not being sensible I think it
>> might be a good idea to put a different keymap on sliced images in that
>> case. Maybe "sliced-image-map" which should be the parent of
>> "image-map". I don't see any misbehavior though.
>
> I added a new map, in which some commands that have no meaning for
> sliced images are absent.
>
> And with that, I'm closing this bug.

Thanks a lot,
Rah Guzar

bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images

[Eli Zaretskii]

> From: Rah Guzar <rahguzar@zohomail.eu>
> Cc: larsi@gnus.org, 62679-done@debbugs.gnu.org
> Date: Sat, 08 Apr 2023 20:29:45 +0200
> 
> Hi Eli,
>    Thanks for the changes. Everything work as expected for me now.
> 
>    However, the new keymap is only partially effective. I cannot
>    use "i r" to rotate a sliced image now but it is possible to do it
>    using "i + r" i.e. the mechanism that is used to allow performing
>    repeated manipulations still uses a map which allows rotations.

That's Somebody Else's Problem, sorry.  This repeat-keymap stuff is
above my paygrade.