A question about text-property stickiness

A question about text-property stickiness

[Darren Hoo]

Hi,

From elisp Manual:
        The text properties `front-sticky' and `rear-nonsticky', when
         used, take precedence over the default NONSTICKINESS specified in
        `text-property-default-nonsticky'.

but the following snip seems not work for me:

(with-current-buffer (get-buffer-create "aaaaa")
  (insert "a")
  (save-excursion
    (backward-char)
    (let ((p (point)))
      (setplist 'mycat '(face highlight rear-nonsticky nil))
      (setq text-property-default-nonsticky '((category . t)))
      (add-text-properties p (1+ p)  '(category mycat))))
  (insert-and-inherit "b"))

I expect "b"  to be highlighted but it is not, why?

Re: A question about text-property stickiness

[Stefan Monnier]

> From elisp Manual:
>         The text properties `front-sticky' and `rear-nonsticky', when
>          used, take precedence over the default NONSTICKINESS specified in
>         `text-property-default-nonsticky'.

> but the following snip seems not work for me:

> (with-current-buffer (get-buffer-create "aaaaa")
>   (insert "a")
>   (save-excursion
>     (backward-char)
>     (let ((p (point)))
>       (setplist 'mycat '(face highlight rear-nonsticky nil))

A nil property value is the same no property value at all (i.e. it's the
default).  So it can't be used to "override" anything.


        Stefan