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Re: `vertical-motion', `goto-line' set point to invisible text

From: Eli Zaretskii
Subject: Re: `vertical-motion', `goto-line' set point to invisible text
Date: Mon, 04 Jul 2011 18:14:31 +0300

> From: Stefan Monnier <address@hidden>
> Cc: address@hidden,  address@hidden
> Date: Mon, 04 Jul 2011 10:01:10 -0400
> >> AFAIK none of those positions are *inside* invisible text
> > Try "M-x describe-text-properties RET", and you will see this isn't
> > true.
> AFAIK, describe-text-properties describes the properties of the char
> *after* point, so if you're at the beginning of invisible text (yet not
> inside it), describe-text-properties will show the `invisible' property.

So how many character positions are invisible after this:

       (insert "line1\nline2\nline3\n")
       (goto-line 2)
       (put-text-property (line-beginning-position)
                          (line-beginning-position 2)
                          'invisible 'invis1)


Also, since we show cursor on the character after point, which is
invisible, what exactly do we mean to achieve in this case by

Finally, what do you think of this:

  (progn (switch-to-buffer "test")
         (insert "aline1\nbline2\ncline3\n")
         (goto-line 2)
         (put-text-property (line-beginning-position)
                            (line-beginning-position 2)
                            'invisible 'invis1)
         (add-to-invisibility-spec 'invis1)
         (goto-char (point-max)))

Eval this in *scratch*, then type "C-p C-x =".  You will see that
Emacs reports that point is position 8 and the character at point is
`b', whereas what is shown (correctly) under the cursor is `c' whose
buffer position is 15.  Do you think this is correct behavior?

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