Preserve point when doing untabify

* tabify.el (untabify): Preserve the current column so that point
doesn't move.

Fixes: debbugs:6032

lisp/ChangeLog

+2011-07-13  Juanma Barranquero  <lekktu@gmail.com>
+
+	* tabify.el (untabify): Preserve the current column so that point
+	doesn't move (bug#6032).
+
 2011-07-13  Lars Magne Ingebrigtsen  <larsi@gnus.org>
 
 	* progmodes/cperl-mode.el (cperl-syntaxify-by-font-lock): Rewrite

lisp/tabify.el

@@ -34,19 +34,21 @@ Called non-interactively, the region is specified by arguments
 START and END, rather than by the position of point and mark.
 The variable `tab-width' controls the spacing of tab stops."
   (interactive "r")
-  (save-excursion
-    (save-restriction
-      (narrow-to-region (point-min) end)
-      (goto-char start)
-      (while (search-forward "\t" nil t)	; faster than re-search
-	(forward-char -1)
-	(let ((tab-beg (point))
-	      (indent-tabs-mode nil)
-	      column)
-	  (skip-chars-forward "\t")
-	  (setq column (current-column))
-	  (delete-region tab-beg (point))
-	  (indent-to column))))))
+  (let ((c (current-column)))
+    (save-excursion
+      (save-restriction
+        (narrow-to-region (point-min) end)
+        (goto-char start)
+        (while (search-forward "\t" nil t)      ; faster than re-search
+          (forward-char -1)
+          (let ((tab-beg (point))
+                (indent-tabs-mode nil)
+                column)
+            (skip-chars-forward "\t")
+            (setq column (current-column))
+            (delete-region tab-beg (point))
+            (indent-to column)))))
+    (move-to-column c)))
 
 (defvar tabify-regexp " [ \t]+"
   "Regexp matching whitespace that tabify should consider.