GNU bug report logs - #62679
29.0.60; Bindings on `image-map` cause error on sliced images

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#62679: closed (29.0.60; Bindings on `image-map` cause error
 on sliced images)
Date: Sat, 08 Apr 2023 09:47:02 +0000

[Message part 1 (text/plain, inline)]

Your message dated Sat, 08 Apr 2023 12:46:55 +0300
with message-id <83zg7in1tc.fsf <at> gnu.org>
and subject line Re: bug#62679: 29.0.60; Bindings on `image-map` cause error on sliced images
has caused the debbugs.gnu.org bug report #62679,
regarding 29.0.60; Bindings on `image-map` cause error on sliced images
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
62679: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=62679
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

[Message part 2 (message/rfc822, inline)]

From: Rah Guzar <rahguzar <at> zohomail.eu>
To: bug-gnu-emacs <at> gnu.org
Subject: 29.0.60; Bindings on `image-map` cause error on sliced images
Date: Wed, 05 Apr 2023 17:23:11 +0200

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
 3.24.37, cairo version 1.17.8) of 2023-04-03 built on cloud108
System Description: openSUSE Tumbleweed

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[Message part 3 (message/rfc822, inline)]

From: Eli Zaretskii <eliz <at> gnu.org>
To: Rah Guzar <rahguzar <at> zohomail.eu>
Cc: larsi <at> gnus.org, 62679-done <at> debbugs.gnu.org
Subject: Re: bug#62679: 29.0.60; Bindings on `image-map` cause error on
 sliced images
Date: Sat, 08 Apr 2023 12:46:55 +0300

> From: Rah Guzar <rahguzar <at> zohomail.eu>
> Cc: larsi <at> gnus.org, 62679 <at> 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.

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