Don't include cl. Don't bother with old Emacs versions.

(thumbs-subst-char-in-string): Deleted.
(thumbs-thumbname): Use subst-char-in-string.
(thumbs-resize-image): Use condition-case, not ignore-errors.
(thumbs-kill-buffer): Likewise.

(thumbs-mode): Make buffer read-only.
(thumbs-make-thumb): Unconditionally accept an existing file.
(thumbs-insert-thumb): Add thumb-image-file property to the image.
(thumbs-do-thumbs-insertion): Be smarter about where to put newlines.
(thumbs-show-thumbs-list): Error if images not supported.
(thumbs-save-current-image): Improve prompt string.
(thumbs-mode-map): Define u, R, x.
(thumbs-unmark): New command.
(thumbs-emboss-image): Minor cleanup.
(thumbs-forward-char, thumbs-backward-char): Skip chars with no image.
(thumbs-rename-images): New command.
(thumbs-show-image-num): Rewrite.  Don't rename the buffer.

(thumbs-current-image): New function.
(thumbs-file-list, thumbs-file-alist): New functions.
(thumbs-find-image): Delete arg L.
Don't set up thumbs-fileL as buffer-local global var.
(thumbs-find-image-at-point): Use thumbs-current-image.
(thumbs-set-image-at-point-to-root-window): Likewise.
(thumbs-delete-images): Use thumbs-current-image, thumbs-file-alist.
Record and warn about errors.  Update thumbs-markedL for deletions.
(thumbs-next-image, thumbs-previous-image): Use thumbs-file-alist.
(thumbs-redraw-buffer): Use thumbs-file-list.
(thumbs-mark): Use thumbs-current-image.
(thumbs-show-name): Use thumbs-current-image.

(thumbs-show-name): Do nothing if no image at point.
(thumbs-mouse-find-image): New command.
(thumbs-mode-map): Bind it to mouse-2.
(thumbs-mode): Make mode-class special.
(thumbs-view-image-mode): Likewise.

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