* lisp/image-mode.el: Fit to width/height for rotated images.

* lisp/image-mode.el: Fit to width/height for rotated images.
(image-transform-scale, image-transform-right-angle-fudge): New vars.
(image-transform-width, image-transform-fit-width): New functions.
(image-transform-properties): Use them.
(image-transform-check-size): New function.
(image-toggle-display-image): Use it (for testing).
(image-transform-set-rotation): Reduce angle mod 360.
Delete obsolete comment.

Fixes: debbugs:11431