Make registers and delete-selection-mode work on rectangles.

* lisp/register.el (describe-register-1): Don't modify the register's value.
(copy-to-register): Obey region-extract-function.
* lisp/delsel.el (delete-active-region): Obey region-extract-function.

lisp/ChangeLog

@@ -1,3 +1,10 @@
+2013-12-08  Stefan Monnier  <monnier@iro.umontreal.ca>
+
+	Make registers and delete-selection-mode work on rectangles.
+	* register.el (describe-register-1): Don't modify the register's value.
+	(copy-to-register): Obey region-extract-function.
+	* delsel.el (delete-active-region): Obey region-extract-function.
+
 2013-12-08  Leo Liu  <sdl.web@gmail.com>
 
 	* progmodes/flymake.el (flymake, flymake-error-bitmap)
@@ -29,8 +36,7 @@
 
 2013-12-07  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
-	* net/shr.el (shr-tag-img): Don't bug out on <img src="">
-	data.
+	* net/shr.el (shr-tag-img): Don't bug out on <img src=""> data.
 
 2013-12-06  Michael Albinus  <michael.albinus@gmx.de>
 
@@ -42,8 +48,8 @@
 
 2013-12-06  Dmitry Gutov  <dgutov@yandex.ru>
 
-	* progmodes/ruby-mode.el (ruby-syntax-propertize-function): Touch
-	up the last change.
+	* progmodes/ruby-mode.el (ruby-syntax-propertize-function):
+	Touch up the last change.
 
 2013-12-06  Leo Liu  <sdl.web@gmail.com>
 
@@ -73,8 +79,8 @@
 
 2013-12-06  Dmitry Gutov  <dgutov@yandex.ru>
 
-	* progmodes/octave.el (inferior-octave-completion-table): Turn
-	back into function, use `completion-table-with-cache'
+	* progmodes/octave.el (inferior-octave-completion-table):
+	Turn back into function, use `completion-table-with-cache'
 	(Bug#11906).  Update all references.
 
 	* minibuffer.el (completion-table-with-cache): New function.

lisp/delsel.el

@@ -78,8 +78,8 @@ any selection."
   "Delete the active region.
 If KILLP in not-nil, the active region is killed instead of deleted."
   (if killp
-      (kill-region (point) (mark))
-    (delete-region (point) (mark)))
+      (kill-region (point) (mark) t)
+    (funcall region-extract-function 'delete-only))
   t)
 
 (defun delete-selection-helper (type)
@@ -197,9 +197,9 @@ then it takes a second \\[keyboard-quit] to abort the minibuffer."
   (define-key minibuffer-local-completion-map "\C-g" 'abort-recursive-edit)
   (define-key minibuffer-local-must-match-map "\C-g" 'abort-recursive-edit)
   (define-key minibuffer-local-isearch-map "\C-g" 'abort-recursive-edit)
-  (dolist (sym '(self-insert-command self-insert-iso yank clipboard-yank
-		 insert-register delete-backward-char backward-delete-char-untabify
-		 delete-char newline-and-indent newline open-line))
+  (dolist (sym '(self-insert-command yank clipboard-yank
+		 insert-register
+                 newline-and-indent newline open-line))
     (put sym 'delete-selection nil))
   ;; continue standard unloading
   nil)

lisp/register.el

@@ -364,6 +364,7 @@ The Lisp value REGISTER is a character."
 	(princ (car val))))
 
      ((stringp val)
+      (setq val (copy-sequence val))
       (if (eq yank-excluded-properties t)
 	  (set-text-properties 0 (length val) nil val)
 	(remove-list-of-text-properties 0 (length val)
@@ -417,19 +418,24 @@ Interactively, second arg is non-nil if prefix arg is supplied."
       (error "Register does not contain text"))))
   (if (not arg) (exchange-point-and-mark)))
 
-(defun copy-to-register (register start end &optional delete-flag)
+(defun copy-to-register (register start end &optional delete-flag region)
   "Copy region into register REGISTER.
 With prefix arg, delete as well.
 Called from program, takes four args: REGISTER, START, END and DELETE-FLAG.
-START and END are buffer positions indicating what to copy."
+START and END are buffer positions indicating what to copy.
+The optional argument REGION if non-nil, indicates that we're not just copying
+some text between START and END, but we're copying the region."
   (interactive (list (register-read-with-preview "Copy to register: ")
 		     (region-beginning)
 		     (region-end)
-		     current-prefix-arg))
-  (set-register register (filter-buffer-substring start end))
+		     current-prefix-arg
+		     t))
+  (set-register register (if region
+			     (funcall region-extract-function delete-flag)
+			   (prog1 (filter-buffer-substring start end)
+			     (if delete-flag (delete-region start end)))))
   (setq deactivate-mark t)
-  (cond (delete-flag
-	 (delete-region start end))
+  (cond (delete-flag)
 	((called-interactively-p 'interactive)
 	 (indicate-copied-region))))