Re-work a fix for bug#10994 based on Le Wang's patch.

* ido.el (ido-remove-consecutive-dups): New helper. 
(ido-completing-read): Use it.
(ido-chop): Revert fix for bug#10994.

2 files changed, 25 insertions, 5 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 76ae9231820..cd5d2f4ee61 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,10 @@
+2013-05-08  Leo Liu  <sdl.web@gmail.com>
+
+        Re-work a fix for bug#10994 based on Le Wang's patch.
+        * ido.el (ido-remove-consecutive-dups): New helper.
+        (ido-completing-read): Use it.
+        (ido-chop): Revert fix for bug#10994.
+
 2013-05-08  Adam Spiers  <emacs@adamspiers.org>
 
         * cus-edit.el (custom-save-variables):
diff --git a/lisp/ido.el b/lisp/ido.el
index bedf00e638d..297e3258338 100644
--- a/lisp/ido.el
+++ b/lisp/ido.el
@@ -3152,15 +3152,13 @@ for first matching file."
     (exit-minibuffer)))
 
 (defun ido-chop (items elem)
-  "Remove all elements before ELEM and put them at the end of ITEMS.
-Use `eq' for comparison."
+  "Remove all elements before ELEM and put them at the end of ITEMS."
   (let ((ret nil)
         (next nil)
         (sofar nil))
     (while (not ret)
       (setq next (car items))
-      ;; Use `eq' to avoid bug http://debbugs.gnu.org/10994
-      (if (eq next elem)
+      (if (equal next elem)
           (setq ret (append items (nreverse sofar)))
         ;; else
         (progn
@@ -4678,6 +4676,21 @@ For details of keybindings, see `ido-find-file'."
                               ido-temp-list))))
     (ido-to-end summaries)))
 
+(defun ido-remove-consecutive-dups (list)
+  "Remove consecutive duplicates in LIST.
+Use `equal' for comparison.  First and last elements are
+considered consecutive."
+  (let ((tail list)
+        (last (make-symbol ""))
+        (result nil))
+    (while (consp tail)
+      (unless (equal (car tail) last)
+        (push (setq last (car tail)) result))
+      (setq tail (cdr tail)))
+    (nreverse (or (and (equal last (car list))
+                       (cdr result))
+                  result))))
+
 ;;; Helper functions for other programs
 
 (put 'dired-do-rename 'ido 'ignore)
@@ -4795,7 +4808,7 @@ DEF, if non-nil, is the default value."
         (ido-directory-nonreadable nil)
         (ido-directory-too-big nil)
         (ido-context-switch-command 'ignore)
-        (ido-choice-list choices))
+        (ido-choice-list (ido-remove-consecutive-dups choices)))
     ;; Initialize ido before invoking ido-read-internal
     (ido-common-initialization)
     (ido-read-internal 'list prompt hist def require-match initial-input)))