Disable ido's annoying auto-merging of directories if no match is found

core/prelude-editor.el

@@ -216,7 +216,8 @@ The body of the advice is in BODY."
       ido-use-filename-at-point 'guess
       ido-max-prospects 10
       ido-save-directory-list-file (expand-file-name "ido.hist" prelude-savefile-dir)
-      ido-default-file-method 'selected-window)
+      ido-default-file-method 'selected-window
+      ido-auto-merge-work-directories-length -1)
 (ido-mode +1)
 (ido-ubiquitous-mode +1)
 ;; smarter fuzzy matching for ido