* Display bug with miscomputed window-start
@ 2002-10-28 16:48 Andreas Schwab
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From: Andreas Schwab @ 2002-10-28 16:48 UTC (permalink / raw)
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
display).
Note that if you change the character that wraps around to a TAB this bug
does not occur.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Deutschherrnstr. 15-19, D-90429 Nürnberg
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
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2002-10-28 16:48 Display bug with miscomputed window-start Andreas Schwab
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