Re: display property strangeness

[Johan Bockgård]

"Chong Yidong" <address@hidden> writes:

> This is a strange one. Evaluate the following two functions. Both of
> them should do the same thing: replace each of the first 3 letters
> in the buffer with the letter "A".
>
> (defun foo ()
>   (interactive)
>   (let ((pos '(1 2 3)))
>     (while pos
>       (put-text-property (car pos) (1+ (car pos)) 'display "A")
>       (setq pos (cdr pos)))))
>
> (defun bar ()
>   (interactive)
>   (progn (put-text-property 1 2 'display "A")
>          (put-text-property 2 3 'display "A")
>          (put-text-property 3 4 'display "A")))


In the former case all display properites are the same (`eq') string.
In the latter case there are three different (`equal') strings.

-- 
Johan Bockgård