Re: [Manuel Serrano <address@hidden>] Re: flyspell before and after-string

[Manuel Serrano]

> I don't know what happens in XEmacs--I only work on Emacs.
> 
> The code you sent creates overlays.  They would continue to exist and
> be displayed until something removes them with delete-overlay.  There
> seems to be code in flyspell.el that tries to delete them, so the
> question is why it does not delete these overlays.
> 
> Manuel, could you debug it?
I still think the problem is in Emacs or in the documentation about
overlay. In the section "Overlays properties" it is said:

-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----
`before-string'
     This property's value is a string to add to the display at the
     beginning of the overlay.  The string does not appear in the
     buffer in any sense--only on the screen.

`after-string'
     This property's value is a string to add to the display at the end
     of the overlay.  The string does not appear in the buffer in any
     sense--only on the screen.
-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----

So, I would have guessed that when a region using an overlay with
a before-string and an after-string properties is deleted, the before-string
and after-string disappear of the screen. That is, I have tried:

-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----
(require 'flyspell)

(defvar ov nil)

(defun add-ov (beg end)
  (setq ov (make-overlay beg end nil t nil))
  (overlay-put ov 'face 'flyspell-incorrect-face)
  (overlay-put ov 'mouse-face 'highlight)
  (overlay-put ov 'before-string "->")
  (overlay-put ov 'after-string "<-"))

(defun del-ov ()
  (delete-overlay ov))
-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----

Then, on a random buffer:

-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----
(add-ov 1 4)
(delete-region 1 4)
-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----

The strings "->" and "<-" are still on the screen. Is this really normal?
For your information, XEmacs 21.4 removes the strings.

Anyway, I will fix flyspell.el so that it runs correctly with Emacs 21.1.

-- 
Manuel


ps: I'm using Emacs 21.1.1 on a Linux box.