Minor fixes to a recent contribution to ido.el

* ido.el (ido-use-virtual-buffers, ido-virtual): Moved a ChangeLog
comment to code, and added a :version tag.
(ido-virtual-buffers): Moved defvar to fix byte-compiler warning.

lisp/ChangeLog

+2010-04-06  John Wiegley  <jwiegley@gmail.com>
+
+	* ido.el (ido-use-virtual-buffers, ido-virtual): Moved a ChangeLog
+	comment to code, and added a :version tag.
+	(ido-virtual-buffers): Moved defvar to fix byte-compiler warning.
+
 2010-04-06  Juanma Barranquero  <lekktu@gmail.com>
 
 	Enable recentf-mode if using virtual buffers.
@@ -41,18 +47,7 @@
 2010-04-04  John Wiegley  <jwiegley@gmail.com>
 
 	* ido.el (ido-use-virtual-buffers): New variable to indicate
-	whether "virtual buffer" support is enabled for IDO.  Essentially
-	it works as follows: Say you are visiting a file and the buffer
-	gets cleaned up by mignight.el.  Later, you want to switch to that
-	buffer, but find it's no longer open.  With virtual buffers
-	enabled, the buffer name stays in the buffer list (using the
-	ido-virtual face, and always at the end), and if you select it, it
-	opens the file back up again.  This allows you to think less about
-	whether recently opened files are still open or not.  Most of the
-	time you can quit Emacs, restart, and then switch to a file buffer
-	that was previously open as if it still were.  NOTE: This feature
-	has been present in iswitchb for several years now, and I'm
-	porting the same logic to IDO.
+	whether "virtual buffer" support is enabled for IDO.
 	(ido-virtual): Face used to indicate virtual buffers in the list.
 	(ido-buffer-internal): If a buffer is chosen, and no such buffer
 	exists, but a virtual buffer of that name does (which would be why

lisp/ido.el

@@ -777,8 +777,19 @@ can be completed using TAB,
 
 (defcustom ido-use-virtual-buffers nil
   "If non-nil, refer to past buffers as well as existing ones.
-This feature relies upon the `recentf' package, which will be
+Essentially it works as follows: Say you are visiting a file and
+the buffer gets cleaned up by mignight.el.  Later, you want to
+switch to that buffer, but find it's no longer open.  With
+virtual buffers enabled, the buffer name stays in the buffer
+list (using the ido-virtual face, and always at the end), and if
+you select it, it opens the file back up again.  This allows you
+to think less about whether recently opened files are still open
+or not.  Most of the time you can quit Emacs, restart, and then
+switch to a file buffer that was previously open as if it still
+were.
+    This feature relies upon the `recentf' package, which will be
 enabled if this variable is configured to a non-nil value."
+  :version "24.1"
   :type 'boolean
   :group 'ido)
 
@@ -808,6 +819,7 @@ subdirs in the alternatives."
 
 (defface ido-virtual '((t (:inherit font-lock-builtin-face)))
   "Face used by ido for matching virtual buffer names."
+  :version "24.1"
   :group 'ido)
 
 (defface ido-indicator  '((((min-colors 88) (class color))
@@ -1124,6 +1136,9 @@ Only used if `ido-use-virtual-buffers' is non-nil.")
 ;; Set to 'ignore to inhibit switching between find-file/switch-buffer.
 (defvar ido-context-switch-command)
 
+;; Caches list of names generated by `ido-add-virtual-buffers-to-list'
+(defvar ido-virtual-buffers nil)
+
 ;;; FUNCTIONS
 
 (defun ido-active (&optional merge)