bug#7474: In latest source, icomplete-mode makes cursor disappear in minibuffer

bug#7474: In latest source, icomplete-mode makes cursor disappear in minibuffer

[Francis Litterio]

Using Emacs built from the latest source on Windows 7, the cursor
can be made to disappear as follows:

1. Start Emacs with: emacs -Q

2. Type: ESC ESC : (icomplete-mode 1) RET C-h v desc

3. The cursor is no longer visisble in the minibuffer.

4. Type: C-b

5. The cursor is visible over the letter 'c' in "desc".

6. Type: C-f

7. The cursor is once again no longer visible.

This is acting like some of the text in the minibuffer has the
'intangible property, but the word "intangible" doesn't appear anywhere
in lisp/icomplete.el.
--
Fran

bug#7474: In latest source, icomplete-mode makes cursor disappear in minibuffer

[Fran]

I wrote:

> Using Emacs built from the latest source on Windows 7, the cursor
> can be made to disappear as follows:
> 
> 1. Start Emacs with: emacs -Q
> 
> 2. Type: ESC ESC : (icomplete-mode 1) RET C-h v desc
> 
> 3. The cursor is no longer visisble in the minibuffer.
> 
> 4. Type: C-b
> 
> 5. The cursor is visible over the letter 'c' in "desc".
> 
> 6. Type: C-f
> 
> 7. The cursor is once again no longer visible.
> 
> This is acting like some of the text in the minibuffer has the
> 'intangible property, but the word "intangible" doesn't appear anywhere
> in lisp/icomplete.el.

I think this has to do with the use of the 'cursor text property in this code in
src/icomplete.el (slightly elided for readability):

(defun icomplete-exhibit ()
  ...
  (when (and icomplete-mode (icomplete-simple-completing-p))
    (save-excursion
      (goto-char (point-max))
                                        ; Insert the match-status information:
      (if (and (> (point-max) (minibuffer-prompt-end))
               buffer-undo-list         ; Wait for some user input.
               ...)
          (let ((text (...)
                (buffer-undo-list t)
                deactivate-mark)
            ;; Do nothing if while-no-input was aborted.
            (when (stringp text)
              (move-overlay icomplete-overlay (point) (point) (current-buffer))
              ;; The current C cursor code doesn't know to use the overlay's
              ;; marker's stickiness to figure out whether to place the cursor
              ;; before or after the string, so let's spoon-feed it the pos.
              (put-text-property 0 1 'cursor t text)
              (overlay-put icomplete-overlay 'after-string text)))))))

bug#7474: In latest source, icomplete-mode makes cursor disappear in minibuffer

[Eli Zaretskii]

> From: flitterio@gmail.com (Francis Litterio)
> Date: Wed, 24 Nov 2010 14:56:28 -0500
> Cc: 
> 
> Using Emacs built from the latest source on Windows 7, the cursor
> can be made to disappear as follows:

I see it on Windows XP as well.  It's probably my fault, due to the
latest changes in cursor positioning code.  I will take a look in a
couple of days.

bug#7474: In latest source, icomplete-mode makes cursor disappear in minibuffer

[Eli Zaretskii]

> Date: Wed, 24 Nov 2010 23:16:21 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: 7474@debbugs.gnu.org
> 
> > From: flitterio@gmail.com (Francis Litterio)
> > Date: Wed, 24 Nov 2010 14:56:28 -0500
> > Cc: 
> > 
> > Using Emacs built from the latest source on Windows 7, the cursor
> > can be made to disappear as follows:
> 
> I see it on Windows XP as well.  It's probably my fault, due to the
> latest changes in cursor positioning code.

As expected, this was due to latest changes in cursor positioning.
Should be fixed now (in revno 102512).  Thanks.