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

[Juri Linkov]

>> BTW, while testing it for image scaling on a quite small image file,
>> Emacs consumed several GB of all available memory and almost all swap,
>> before I noticed and evaluated M-: (clear-image-cache) that freed memory.
>> 
>> Memory leak?
>
> Was this on X?

Yes, on X.  

> Emacs probably keeps a copy of the image in memory for each size until
> the image cache is cleared or pruned.

Could it clear the image cache automatically when it grows
over some memory limit?