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Weird redisplay bug

From: Juanma Barranquero
Subject: Weird redisplay bug
Date: Fri, 22 Jun 2007 14:31:46 +0200

This redisplay bug is nothing to worry much about, because it only
happens in unusual circunstances. Still, it's quite weird.

Create an empty buffer, and then evaluate the following code:

  (setq buffer-display-table (or buffer-display-table (make-display-table)))
  (insert (propertize "text\ntext\r\ntext\n" 'face '(:foreground "yellow")))
  (aset buffer-display-table 13 [0])
  (redisplay t))

The line containing the character set to "\0" in the display table is
wrong. See the attached picture.

- The foreground color is irrelevant.
- The fact that there's a non-default foreground color is relevant;
instead of '(:foreground "yellow") you can use a font-lock face, for
- That the character being displayed as "\0" is ^M is not relevant;
^L produces the same effect, and even a normal ASCII letter.
- The position of the character on the line is irrelevant.
- That it is substituted by "\0" is relevant.

And now, the punchline:
- It does *not* happen with ClearType *on*.

Nice, isn't?


Attachment: emacs.png
Description: PNG image

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