GNU bug report logs - #59902
30.0.50; Image overlay is not updated until the cursor moves to the overlay

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Message #41 received at 59902 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Ihor Radchenko <yantar92 <at> posteo.net>
Cc: 59902 <at> debbugs.gnu.org
Subject: Re: bug#59902: 30.0.50; Image overlay is not updated until the
 cursor moves to the overlay
Date: Sat, 10 Dec 2022 16:18:44 +0200

> From: Ihor Radchenko <yantar92 <at> posteo.net>
> Cc: 59902 <at> debbugs.gnu.org
> Date: Sat, 10 Dec 2022 11:10:19 +0000
> 
> Eli Zaretskii <eliz <at> gnu.org> writes:
> 
> >> The current Emacs' behaviour is unexpected and very confusing here.
> >> Ideally, Emacs should be able to judge by itself whether to update
> >> cached image in memory.
> >
> > You want Emacs to hit the disk and process the file on each redisplay
> > cycle?
> 
> No. It can be less frequent. Maybe just when a new image view is created
> (like in overlay). Or maybe on timer - make images in the image cache
> expire after some time.

The image-handling code doesn't necessarily know where the image came
from.

The idea of clearing images from time to time was discussed, but AFAIR
we didn't find a good way that fits all the needs for doing so.

I think this is best left to the application level.  In particular, in
this case, the application _knows_ when it will replace the image
file.

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