ido.el: Consider the possibility of buffer names changing after kill-buffer.

lisp/ChangeLog

+2010-01-18  Óscar Fuentes  <ofv@wanadoo.es>
+
+	* ido.el (ido-cur-list): Initialize as nil.
+	Remove obsolete information from commentary.
+        (ido-choice-list): Initialize as nil.
+        (ido-get-bufname): Reject minibuffers.
+        (ido-make-buffer-list): If "default" is a nonexistent
+        buffer, ignore it, as per the docstring.
+        (ido-kill-buffer-internal): New function.
+        (ido-kill-buffer-at-head): Use it.
+        (ido-visit-buffer): Likewise.
+
 2010-01-18  Chong Yidong  <cyd@stupidchicken.com>
 
 	* calendar/time-date.el (date-to-time): Doc fix (Bug#5408).

lisp/ido.el

@@ -1042,11 +1042,11 @@ Value is an integer which is number of chars to right of prompt.")
 ;; Stores the current list of items that will be searched through.
 ;; The list is ordered, so that the most interesting item comes first,
 ;; although by default, the files visible in the current frame are put
-;; at the end of the list.  Created by `ido-make-item-list'.
-(defvar ido-cur-list)
+;; at the end of the list.
+(defvar ido-cur-list nil)
 
 ;; Stores the choice list for ido-completing-read
-(defvar ido-choice-list)
+(defvar ido-choice-list nil)
 
 ;; Stores the list of items which are ignored when building
 ;; `ido-cur-list'.  It is in no specific order.
@@ -3344,7 +3344,7 @@ for first matching file."
     (if ido-temp-list
 	(nconc ido-temp-list ido-current-buffers)
       (setq ido-temp-list ido-current-buffers))
-    (if default
+    (if (and default (buffer-live-p (get-buffer default)))
 	(progn
 	  (setq ido-temp-list
 		(delete default ido-temp-list))
@@ -3590,6 +3590,7 @@ for first matching file."
   ;; Used by `ido-get-buffers-in-frames' to walk through all windows
   (let ((buf (buffer-name (window-buffer win))))
 	(unless (or (member buf ido-bufs-in-frame)
+		    (minibufferp buf)
 		    (member buf ido-ignore-item-temp-list))
 	  ;; Only add buf if it is not already in list.
 	  ;; This prevents same buf in two different windows being
@@ -3830,6 +3831,27 @@ for first matching file."
 	      ;;(add-hook 'completion-setup-hook 'completion-setup-function)
 	      (display-completion-list completion-list)))))))
 
+(defun ido-kill-buffer-internal (buf)
+  "Kill buffer BUF and rebuild ido's buffer list if needed."
+  (if (not (kill-buffer buf))
+      ;; buffer couldn't be killed.
+      (setq ido-rescan t)
+    ;; else buffer was killed so remove name from list.
+    (setq ido-cur-list (delq buf ido-cur-list))
+    ;; Some packages, like uniquify.el, may rename buffers when one
+    ;; is killed, so we need to test this condition to avoid using
+    ;; an outdated list of buffer names. We don't want to always
+    ;; rebuild the list of buffers, as this alters the previous
+    ;; buffer order that the user was seeing on the prompt. However,
+    ;; when we rebuild the list, we try to keep the previous second
+    ;; buffer as the first one.
+    (catch 'update
+      (dolist (b ido-cur-list)
+	(unless (get-buffer b)
+	  (setq ido-cur-list (ido-make-buffer-list (cadr ido-matches)))
+	  (setq ido-rescan t)
+	  (throw 'update nil))))))
+
 ;;; KILL CURRENT BUFFER
 (defun ido-kill-buffer-at-head ()
   "Kill the buffer at the head of `ido-matches'.
@@ -3840,7 +3862,7 @@ If cursor is not at the end of the user input, delete to end of input."
     (let ((enable-recursive-minibuffers t)
 	  (buf (ido-name (car ido-matches))))
       (when buf
-	(kill-buffer buf)
+	(ido-kill-buffer-internal buf)
 	;; Check if buffer still exists.
 	(if (get-buffer buf)
 	    ;; buffer couldn't be killed.
@@ -3884,7 +3906,7 @@ Record command in `command-history' if optional RECORD is non-nil."
      ((eq method 'kill)
       (if record
 	  (ido-record-command 'kill-buffer buffer))
-      (kill-buffer buffer))
+      (ido-kill-buffer-internal buffer))
 
      ((eq method 'other-window)
       (if record