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bug#4040: 23.1; before-string overlay causes error when scrolling


From: Andreas Schwab
Subject: bug#4040: 23.1; before-string overlay causes error when scrolling
Date: Wed, 05 Aug 2009 00:51:05 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.1 (gnu/linux)

Evaluating this form signals an error:

ELISP> (with-temp-buffer
         (switch-to-buffer (current-buffer))
         (insert-char ?x (1+ (window-width)))
         (let ((ovl (make-overlay (1- (point)) (point))))
           (overlay-put ovl 'before-string " "))
         (goto-char 1)
         (scroll-up 1))
*** Eval error ***  Args out of range: 0

It comes from get_char_property_and_overlay, which is called with
position == 0 by pos_visible_p.

Andreas.

-- 
Andreas Schwab, address@hidden
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