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: Rah Guzar <rahguzar <at> zohomail.eu>
Subject: bug#62679: closed (Re: bug#62679: 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 bug report

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

which was filed against the emacs package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 62679 <at> debbugs.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: 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.

[Message part 3 (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

Configured using:
 'configure --host=x86_64-suse-linux-gnu --build=x86_64-suse-linux-gnu
 --program-prefix= --disable-dependency-tracking --prefix=/usr
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