* lisp/image/image-dired.el (image-dired-thumbnail-mode-map): Also
remap 'left-char' and 'right-char'.
"<remap> <backward-char>" #'image-dired-backward-image
"<remap> <next-line>" #'image-dired-next-line
"<remap> <previous-line>" #'image-dired-previous-line
+ "<remap> <left-char>" #'image-dired-backward-image
+ "<remap> <right-char>" #'image-dired-forward-image
"<remap> <beginning-of-buffer>" #'image-dired-beginning-of-buffer
"<remap> <end-of-buffer>" #'image-dired-end-of-buffer
"<remap> <move-beginning-of-line>" #'image-dired-move-beginning-of-line