[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Display bug with miscomputed window-start
From: |
Andreas Schwab |
Subject: |
Display bug with miscomputed window-start |
Date: |
Mon, 28 Oct 2002 17:48:49 +0100 |
User-agent: |
Gnus/5.090007 (Oort Gnus v0.07) Emacs/21.3.50 (ia64-suse-linux) |
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, address@hidden
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."
[Prev in Thread] |
Current Thread |
[Next in Thread] |
- Display bug with miscomputed window-start,
Andreas Schwab <=