* lisp/image.el: Mouse-wheel scaling on images (bug#38187)
* lisp/image.el (image-mouse-increase-size) (image-mouse-decrease-size): New commands. (image-map): Bind C-wheel-down and C-mouse-5 to image-mouse-decrease-size, C-wheel-up and C-mouse-4 to image-mouse-increase-size.
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