bug#38187: 27.0.50; No mouse-wheel scaling on images

[Eli Zaretskii]

> From: Juri Linkov <juri@linkov.net>
> Cc: Eli Zaretskii <eliz@gnu.org>,  stefan@marxist.se,  38187@debbugs.gnu.org
> Date: Fri, 22 Nov 2019 00:57:24 +0200
> 
> Currently the default value of image-cache-eviction-delay is
> 300 seconds.
> 
> But the documentation also says:
> 
>   "If the cache contains a large number of images,
>    the actual eviction time may be shorter."
> 
> And code has this comment:
> 
>   /* If the number of cached images has grown unusually large,
>      decrease the cache eviction delay (Bug#6230).  */
> 
> Does this mean the number of cached images was not large enough?

Maybe.  the only way to answer that is to run the recipe under a
debugger with a breakpoint at that place, and have the breakpoint
print the number of images in the cache.