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Re: Bug in `next-line' when last char in line has after-string property
From: |
Kim F. Storm |
Subject: |
Re: Bug in `next-line' when last char in line has after-string property |
Date: |
Sun, 07 Jan 2007 23:55:19 +0100 |
User-agent: |
Gnus/5.11 (Gnus v5.11) Emacs/22.0.92 (gnu/linux) |
Ralf Angeli <address@hidden> writes:
> * Kim F. Storm (2007-01-05) writes:
>
>> Everybody, please watch out for problems with line movement in buffers
>> with overlay and text-property strings.
>
> If you execute the following code which inserts a few strings into the
> buffer *foo* and then puts three overlays in the buffer where each one
> is covering a line break in the buffer and using a line break in the
> display string, the line in the middle will be left out if one tries
> to move point up using `C-p' several times. Downwards with `C-n' is
> okay.
>
> This is not a regression, but also happened like this before your last
> change. It just caught my eye when checking for problems with the new
> code.
>
> (progn
> (pop-to-buffer (get-buffer-create "*foo*"))
> (dotimes (i 5)
> (insert (make-string 10 ?x) "\n"))
> (let ((ov (make-overlay 17 24)))
> (overlay-put ov 'display "aaa\n"))
> (let ((ov (make-overlay 29 35)))
> (overlay-put ov 'display "aaa\n"))
> (let ((ov (make-overlay 40 46)))
> (overlay-put ov 'display "aaa\n")))
Indeed. It is pretty easy to construct expamples like that which
break the current code. It needs a big overhaul after the release.
But thanks for testing -- and testing that the latest change
didn't make things worse :-)
--
Kim F. Storm <address@hidden> http://www.cua.dk