* test/lisp/image/image-dired-util-tests.el
(image-dired-thumb-name/image-dired)
(image-dired-thumb-name/per-directory): Make these tests work on
MS-Windows, where a file name such as "/foo/bar" gets added the
drive letter when passed through 'expand-file-name'.
* lisp/image/image-dired-util.el (image-dired-thumb-name): Always
end thumbnail name in ".jpg" and simplify naming to just use the
SHA-1 hash. (Bug#57961)
* test/lisp/image/image-dired-util-tests.el
(image-dired-thumb-name/image-dired): Adjust test for the above
change.
* etc/NEWS: Announce the above change.