Re: Completion details and vertical completion format

[Gregory Heytings <gregory@heytings.org>]

>>> Could you please explain what did you expect to see.
>> 
>> Ideally, Emacs switches to `one-column' format automatically when 
>> completion candidates have long annotations and keep `vertical' for 
>> short or no annotations.
>
> Even with long annotations there can be enough room for two columns, if 
> the font is small enough.
>
> That being said, currently the options completions-detailed and 
> completions-format are incompatible: completions-format vertical has 
> either no effet (with a small enough font), or a wrong effect (the one 
> on your screenshots).
>

Arash, does the patch below fix your problem?  The current code assumes 
"at least 2 columns", but that's wrong when completion candidates become 
long enough.

diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index 6bb0fa3ae9..5faa3c8d4e 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -2025,8 +2025,8 @@ completion--insert-strings
  	   (window (get-buffer-window (current-buffer) 0))
  	   (wwidth (if window (1- (window-width window)) 79))
  	   (columns (min
-		     ;; At least 2 columns; at least 2 spaces between columns.
-		     (max 2 (/ wwidth (+ 2 length)))
+		     ;; At least 2 spaces between columns.
+		     (max 1 (/ wwidth (+ 2 length)))
  		     ;; Don't allocate more columns than we can fill.
  		     ;; Windows can't show less than 3 lines anyway.
  		     (max 1 (/ (length strings) 2))))