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bug#25607: 26.0.50; Ido does not work with tramp anymore

From: Dmitry Gutov
Subject: bug#25607: 26.0.50; Ido does not work with tramp anymore
Date: Sat, 4 Feb 2017 02:41:06 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.0

Hi Michael,

On 03.02.2017 16:34, Michael Albinus wrote:
emacs -Q
M-x ido-mode
C-x C-f
(Here ido completion works)
Press backspace until you only have 'Find file: /' as prompt
(Here completion still works)
Type sudo:address@hidden:/
(No completion)

It used to ask sudo password and then completion was working.

Likely, the changed behaviour comes from my commit
6653bb45d3697c9372cc77773c49f52399740b51, fixing bug#24947.

This commit may be going in the right direction, but do you know why even pressing TAB at the end of the offered scenario doesn't make Emacs ask for password?

The patch below makes Ido ask for password if I type TAB twice. But not after I do that once, which is puzzling. But maybe the function uses the completions already completed for the minibuffer, as a kind of optimization.

diff --git a/lisp/ido.el b/lisp/ido.el
index e18464d..2c773b0 100644
--- a/lisp/ido.el
+++ b/lisp/ido.el
@@ -2541,7 +2541,8 @@ ido-set-common-completion
 (defun ido-complete ()
   "Try and complete the current pattern amongst the file names."
-  (let (res)
+  (let (non-essential
+        res)
       ;; Do nothing

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