Hi,

It seem to me that animating webp images is sometimes leaking
memory.  This memory is not returned when buffer is killed and not
by calling clear-image-cache either.

For example running the following with the attached example
nooshi.webp copied to ones home directory seem to increase memory
consumption for every call (the amount it increases varies).

(require 'cl-macs)
(require 'image)

(defun memory ()
  (cdr (assq 'vsize (process-attributes (emacs-pid)))))

(let ((before (memory)))
  (with-temp-buffer
    (cl-loop for file in (make-list 10 "~/nooshi.webp")
             do (let ((image (create-image file nil nil :width 150)))
                  (display-buffer (current-buffer))
                  (insert-image image)
                  (image-animate image nil t)))
    (sit-for 1))
  (clear-image-cache)
  (message "memory increased %s KB" (- (memory) before)))

Regards,
/Johan