Change doc-view-mode-map prefix key 's' to 'c'.

* doc/emacs/misc.texi (DocView Slicing): Change prefix key 's' to 'c'.

* lisp/doc-view.el (doc-view-mode-map): Change prefix key 's' to 'c'.

* lisp/image-mode.el (image-mode-map): Add image-transform-set-scale to menu.

* doc/emacs/files.texi (Image Mode): Describe commands
image-transform-fit-both, image-transform-set-scale, image-transform-reset.

* etc/NEWS: Rearrange image sections.

https://lists.gnu.org/archive/html/emacs-devel/2020-04/msg01315.html

doc/emacs/files.texi

@@ -2113,8 +2113,6 @@ point.  Partial Completion mode offers other features extending
 
 @findex image-mode
 @findex image-toggle-display
-@findex image-next-file
-@findex image-previous-file
 @cindex images, viewing
   Visiting image files automatically selects Image mode.  In this
 major mode, you can type @kbd{C-c C-c} (@code{image-toggle-display})
@@ -2136,6 +2134,19 @@ window, so this is only necessary if you customize the default
 behavior by using the options @code{image-auto-resize} and
 @code{image-auto-resize-on-window-resize}.
 
+@findex image-transform-fit-both
+@findex image-transform-set-scale
+@findex image-transform-reset
+To resize the image manually you can use the command
+@code{image-transform-fit-both} bound to @kbd{s b}
+that fits the image to both the window height and width.
+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}.
+
+@findex image-next-file
+@findex image-previous-file
 You can press @kbd{n} (@code{image-next-file}) and @kbd{p}
 (@code{image-previous-file}) to visit the next image file and the
 previous image file in the same directory, respectively.
@@ -2204,7 +2215,6 @@ can be used to transform the image in question to @acronym{PNG} before
 displaying.  GraphicsMagick, ImageMagick and @command{ffmpeg} are
 currently supported for image conversions.
 
-
 @findex thumbs-mode
 @cindex mode, Thumbs
   The Image-Dired package can also be used to view images as

doc/emacs/misc.texi

@@ -617,12 +617,12 @@ of pages to display.  A slice is a rectangle within the page area;
 once you specify a slice in DocView, it applies to whichever page you
 look at.
 
-  To specify the slice numerically, type @kbd{s s}
+  To specify the slice numerically, type @kbd{c s}
 (@code{doc-view-set-slice}); then enter the top left pixel position
 and the slice's width and height.
 @c ??? how does this work?
 
-  A more convenient graphical way to specify the slice is with @kbd{s
+  A more convenient graphical way to specify the slice is with @kbd{c
 m} (@code{doc-view-set-slice-using-mouse}), where you use the mouse to
 select the slice.  Simply press and hold the left mouse button at the
 upper-left corner of the region you want to have in the slice, then
@@ -631,10 +631,10 @@ button.
 
   The most convenient way is to set the optimal slice by using
 BoundingBox information automatically determined from the document by
-typing @kbd{s b} (@code{doc-view-set-slice-from-bounding-box}).
+typing @kbd{c b} (@code{doc-view-set-slice-from-bounding-box}).
 
 @findex doc-view-reset-slice
-  To cancel the selected slice, type @kbd{s r}
+  To cancel the selected slice, type @kbd{c r}
 (@code{doc-view-reset-slice}).  Then DocView shows the entire page
 including its entire margins.
 

etc/NEWS

@@ -866,6 +866,11 @@ its functions.
 *** A new user option 'doc-view-pdftotext-program-args' has been added
 to allow controlling how the conversion to text is done.
 
++++
+*** The prefix key 's' was changed to 'c' for slicing commands
+to avoid conflicts with image-mode key 's'.  The new key 'c' still
+has good mnemonics of "cut", "clip", "crop".
+
 ** Ido
 
 ---
@@ -3523,12 +3528,32 @@ functions.
 *** 'image-mode' now uses this library to automatically rotate images
 according to the orientation in the Exif data, if any.
 
++++
+*** The command 'image-rotate' now accepts a prefix argument.
+With a prefix argument, 'image-rotate' now rotates the image at point
+90 degrees counter-clockwise, instead of the default clockwise.
+
 +++
 *** In 'image-mode' the image is resized automatically to fit in window.
 By default, the image will resize upon first display and whenever the
 window's dimensions change.  Two user options 'image-auto-resize' and
 'image-auto-resize-on-window-resize' control the resizing behavior
-(including the possibility to disable auto-resizing).
+(including the possibility to disable auto-resizing).  A new key
+prefix 's' contains the commands that can be used to fit the image to
+the window manually.
+
+---
+*** Some 'image-mode' variables are now buffer-local.
+The image parameters 'image-transform-rotation',
+'image-transform-scale' and 'image-transform-resize' are now declared
+buffer-local, so each buffer could have its own values for these
+parameters.
+
++++
+*** Three new 'image-mode' commands have been added: 'm', which marks
+the file in the dired buffer(s) for the directory the file is in; 'u',
+which unmarks the file; and 'w', which pushes the current buffer's file
+name to the kill ring.
 
 ---
 *** New library image-converter.
@@ -3549,26 +3574,6 @@ These now default to using 'image-mode'.
 some years back.  It now respects 'imagemagick-types-inhibit' as a way
 to disable that.
 
----
-*** Some 'image-mode' variables are now buffer-local.
-The image parameters 'image-transform-rotation',
-'image-transform-scale' and 'image-transform-resize' are now declared
-buffer-local, so each buffer could have its own values for these
-parameters.
-
-+++
-*** Three new 'image-mode' commands have been added: 'm', which marks
-the file in the dired buffer(s) for the directory the file is in; 'u',
-which unmarks the file; and 'w', which pushes the current buffer's file
-name to the kill ring.
-
-+++
-*** The command 'image-rotate' now accepts a prefix argument.
-With a prefix argument, 'image-rotate' now rotates the image at point
-90 degrees counter-clockwise, instead of the default clockwise.
-
-*** 'image-mode' has a new key prefix 's' for transformation commands.
-
 ** Modules
 
 ---

lisp/doc-view.el

@@ -59,16 +59,16 @@
 ;; will be remembered and applied to all pages of the current
 ;; document.  This enables you to cut away the margins of a document
 ;; to save some space.  To select a slice you can use
-;; `doc-view-set-slice' (bound to `s s') which will query you for the
+;; `doc-view-set-slice' (bound to `c s') which will query you for the
 ;; coordinates of the slice's top-left corner and its width and
 ;; height.  A much more convenient way to do the same is offered by
-;; the command `doc-view-set-slice-using-mouse' (bound to `s m').
+;; the command `doc-view-set-slice-using-mouse' (bound to `c m').
 ;; After invocation you only have to press mouse-1 at the top-left
 ;; corner and drag it to the bottom-right corner of the desired slice.
 ;; Even more accurate and convenient is to use
-;; `doc-view-set-slice-from-bounding-box' (bound to `s b') which uses
+;; `doc-view-set-slice-from-bounding-box' (bound to `c b') which uses
 ;; the BoundingBox information of the current page to set an optimal
-;; slice.  To reset the slice use `doc-view-reset-slice' (bound to `s
+;; slice.  To reset the slice use `doc-view-reset-slice' (bound to `c
 ;; r').
 ;;
 ;; You can also search within the document.  The command `doc-view-search'
@@ -433,10 +433,10 @@ Typically \"page-%s.png\".")
     ;; Killing the buffer (and the process)
     (define-key map (kbd "K")         'doc-view-kill-proc)
     ;; Slicing the image
-    (define-key map (kbd "s s")       'doc-view-set-slice)
-    (define-key map (kbd "s m")       'doc-view-set-slice-using-mouse)
-    (define-key map (kbd "s b")       'doc-view-set-slice-from-bounding-box)
-    (define-key map (kbd "s r")       'doc-view-reset-slice)
+    (define-key map (kbd "c s")       'doc-view-set-slice)
+    (define-key map (kbd "c m")       'doc-view-set-slice-using-mouse)
+    (define-key map (kbd "c b")       'doc-view-set-slice-from-bounding-box)
+    (define-key map (kbd "c r")       'doc-view-reset-slice)
     ;; Searching
     (define-key map (kbd "C-s")       'doc-view-search)
     (define-key map (kbd "<find>")    'doc-view-search)

lisp/image-mode.el

@@ -452,12 +452,12 @@ call."
 
     ;; Transformation keys
     (define-key map "sf" 'image-mode-fit-frame)
-    (define-key map "sb" 'image-transform-fit-both)
     (define-key map "sh" 'image-transform-fit-to-height)
     (define-key map "sw" 'image-transform-fit-to-width)
+    (define-key map "sb" 'image-transform-fit-both)
+    (define-key map "ss" 'image-transform-set-scale)
     (define-key map "sr" 'image-transform-set-rotation)
     (define-key map "s0" 'image-transform-reset)
-    (define-key map "ss" 'image-transform-set-scale)
 
     ;; Multi-frame keys
     (define-key map (kbd "RET") 'image-toggle-animation)
@@ -512,6 +512,8 @@ call."
 	 :help "Resize image to match the window width"]
 	["Fit to Window Height and Width" image-transform-fit-both
 	 :help "Resize image to match the window height and width"]
+	["Set Scale..." image-transform-set-scale
+	 :help "Resize image by specified scale factor"]
 	["Rotate Image..." image-transform-set-rotation
 	 :help "Rotate the image"]
 	["Reset Transformations" image-transform-reset