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bug#34038: 26.1; set-window-start sometimes fails to set window start
From: |
Markus Triska |
Subject: |
bug#34038: 26.1; set-window-start sometimes fails to set window start |
Date: |
Sat, 12 Jan 2019 14:25:57 +0100 |
User-agent: |
Emacs/24.5 |
martin rudalics <rudalics@gmx.at> writes:
> All we need to know for why this happens would be the exact sequence
> of (window) point and window start settting operations performed by
> that application.
The actual application performs actions that are quite involved, so I
try to break it down to simpler cases that need fewer operations.
For example, please try the following snippet:
(progn
(goto-char (point-max))
(insert "\n")
(dotimes (x (window-height))
(insert (format "%s\n" x)))
(let ((b (buffer-string))
(p (point)))
(redisplay)
(set-window-start nil p)
(let ((wp (window-point)))
(read-key "Step 1. Please press a key to continue.")
(dotimes (x (round (/ (window-height) 2)))
(insert (format "more lines ... %s\n" x)))
(read-key "Step 2. Please press a key to continue.")
(erase-buffer)
(insert b)
(set-window-point nil wp)
(set-window-start nil p))))
In this snippet, I try to restore the exact same configuration that you
see when "Step 1 ..." is displayed, i.e., window-start is set so that
point is on the very first line, which is blank. When you press a key at
this point, then a few more lines of text are inserted. Then, please
press another key when "Step 2 ..." is displayed.
What I observe after these forms is that point is unexpectedly placed
vertically centered in the window instead of at the topmost line.
Please note that I am now using set-window-point, and also
set-window-start with third argument (implicitly) nil. I get the exact
same result when I use t for the third argument of set-window-start.
Can you reproduce this? Is there a way to reliably restore this?
Thank you and all the best!
Markus
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Markus Triska, 2019/01/10
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Eli Zaretskii, 2019/01/11
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Markus Triska, 2019/01/11
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Eli Zaretskii, 2019/01/11
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Markus Triska, 2019/01/11
- bug#34038: 26.1; set-window-start sometimes fails to set window start, martin rudalics, 2019/01/11
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Markus Triska, 2019/01/11
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Eli Zaretskii, 2019/01/11
- bug#34038: 26.1; set-window-start sometimes fails to set window start, martin rudalics, 2019/01/12
- bug#34038: 26.1; set-window-start sometimes fails to set window start,
Markus Triska <=
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Eli Zaretskii, 2019/01/12
- bug#34038: 26.1; set-window-start sometimes fails to set window start, martin rudalics, 2019/01/12
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Markus Triska, 2019/01/12
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Eli Zaretskii, 2019/01/12
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Alan Mackenzie, 2019/01/11
- bug#34038: 26.1; set-window-start sometimes fails to set window start, martin rudalics, 2019/01/12
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Alan Mackenzie, 2019/01/12
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Eli Zaretskii, 2019/01/12
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Alan Mackenzie, 2019/01/12
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Eli Zaretskii, 2019/01/12