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address@hidden: Display bug with miscomputed window-start]

From: Richard Stallman
Subject: address@hidden: Display bug with miscomputed window-start]
Date: Mon, 28 Oct 2002 22:02:11 -0500

Since this is in redisplay, could you look at it?

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Envelope-to: address@hidden
Delivery-date: Mon, 28 Oct 2002 11:54:08 -0500
X-Authentication-Warning: sykes.suse.de: schwab set sender to address@hidden 
using -f
To: address@hidden
Subject: Display bug with miscomputed window-start
X-Yow: I don't think you fellows would do so much RAPING and PILLAGING if
 played more PINBALL and watched CABLE TELEVISION!!
From: Andreas Schwab <address@hidden>
Sender: address@hidden
Date: Mon, 28 Oct 2002 17:48:49 +0100

Redisplay does not correctly handle characters that wrap around at the
right margin.  To reproduce:

- - Insert a bunch of ^A (C-q C-a) in a buffer so that the line wraps around
- - Go to point-min
- - If there is an even number of columns insert a space, so that the last
  ^A in the line wraps around, i.e the ^ is in the last column and the A
  appears at the start of the next screen line.
- - Do M-1 C-v (scroll-up 1)

The cursor will now be somewhere in the middle of the window, maybe not
even inside any buffer text.  Now click on first visible ^A to move point
there and evaluate (list (point) (window-start)).  You will get two
different numbers that are off by one (`(42 41)' for an 80 column

Note that if you change the character that wraps around to a TAB this bug
does not occur.


- -- 
Andreas Schwab, SuSE Labs, address@hidden
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 N├╝rnberg
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

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