Rename image transform commands to be less confusing

* lisp/image-mode.el
(image-transform-original): Rename from this...
(image-transform-reset-to-original): ...to this.  Make old name
into an obsolete function alias and update all callers.
(image-transform-reset): Rename from this...
(image-transform-reset-to-initial): ...to this.  Make old name
into an obsolete function alias and update all callers.
(Bug#51451)
* doc/emacs/files.texi (Image Mode): Update for above change.

doc/emacs/files.texi

@@ -2272,16 +2272,16 @@ behavior by using the options @code{image-auto-resize} and
 @findex image-transform-fit-to-window
 @findex image-transform-set-percent
 @findex image-transform-set-scale
-@findex image-transform-reset
+@findex image-transform-reset-to-initial
 To resize the image manually you can use the command
 @code{image-transform-fit-to-window} bound to @kbd{s w} that fits the
 image to both the window height and width.  To scale the image to a
 percentage of its original size, use the command
-@code{image-transform-set-percent} bound to @kbd{s p}.  To scale
-the image specifying a scale factor, use the command
+@code{image-transform-set-percent} bound to @kbd{s p}.  To scale the
+image specifying a scale factor, use the command
 @code{image-transform-set-scale} bound to @kbd{s s}.  To reset all
-transformations to the initial state, use @code{image-transform-reset}
-bound to @kbd{s 0}.
+transformations to the initial state, use
+@code{image-transform-reset-to-initial} bound to @kbd{s 0}.
 
 @findex image-next-file
 @findex image-previous-file

etc/NEWS

@@ -1988,6 +1988,14 @@ These commands horizontally and vertically flip the image under point.
 It allows setting the image size to a percentage of its original size,
 and is bound to "s p" in Image mode.
 
++++
+*** 'image-transform-original' renamed to 'image-transform-reset-to-original'.
+The old name was confusing, and is now an obsolete function alias.
+
++++
+*** 'image-transform-reset' renamed to 'image-transform-reset-to-initial'.
+The old name was confusing, and is now an obsolete function alias.
+
 ** Images
 
 +++

lisp/image-mode.el

@@ -499,8 +499,8 @@ image as text, when opening such images in `image-mode'."
   "s s"     #'image-transform-set-scale
   "s r"     #'image-transform-set-rotation
   "s m"     #'image-transform-set-smoothing
-  "s o"     #'image-transform-original
-  "s 0"     #'image-transform-reset
+  "s o"     #'image-transform-reset-to-original
+  "s 0"     #'image-transform-reset-to-initial
 
   ;; Multi-frame keys
   "RET"     #'image-toggle-animation
@@ -571,9 +571,9 @@ image as text, when opening such images in `image-mode'."
      :help "Set rotation angle of the image"]
     ["Set Smoothing..." image-transform-set-smoothing
      :help "Toggle smoothing"]
-    ["Original Size" image-transform-original
+    ["Original Size" image-transform-reset-to-original
      :help "Reset image to actual size"]
-    ["Reset to Default Size" image-transform-reset
+    ["Reset to Default Size" image-transform-reset-to-initial
      :help "Reset all image transformations to initial size"]
     "--"
     ["Show Thumbnails"
@@ -1608,14 +1608,14 @@ ROTATION should be in degrees."
   (setq image--transform-smoothing smoothing)
   (image-toggle-display-image))
 
-(defun image-transform-original ()
+(defun image-transform-reset-to-original ()
   "Display the current image with the original (actual) size and rotation."
   (interactive nil image-mode)
   (setq image-transform-resize nil
 	image-transform-scale 1)
   (image-toggle-display-image))
 
-(defun image-transform-reset ()
+(defun image-transform-reset-to-initial ()
   "Display the current image with the default (initial) size and rotation."
   (interactive nil image-mode)
   (setq image-transform-resize image-auto-resize
@@ -1624,6 +1624,9 @@ ROTATION should be in degrees."
         image--transform-smoothing nil)
   (image-toggle-display-image))
 
+(define-obsolete-function-alias 'image-transform-original #'image-transform-reset-to-original "29.1")
+(define-obsolete-function-alias 'image-transform-reset #'image-transform-reset-to-initial "29.1")
+
 (provide 'image-mode)
 
 ;;; image-mode.el ends here

lisp/image/image-dired.el

@@ -1508,14 +1508,14 @@ Dired."
 
 (defun image-dired-display-current-image-full ()
   "Display current image in full size."
-  (declare (obsolete image-transform-original "29.1"))
+  (declare (obsolete image-transform-reset-to-original "29.1"))
   (interactive nil image-dired-thumbnail-mode)
   (let ((file (image-dired-original-file-name)))
     (if file
         (progn
           (image-dired-display-image file)
           (with-current-buffer image-dired-display-image-buffer
-            (image-transform-original)))
+            (image-transform-reset-to-original)))
       (error "No original file name at point"))))
 
 (defun image-dired-display-current-image-sized ()