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bug#34038: 26.1; set-window-start sometimes fails to set window start
From: |
martin rudalics |
Subject: |
bug#34038: 26.1; set-window-start sometimes fails to set window start |
Date: |
Sat, 12 Jan 2019 15:12:31 +0100 |
> (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
I think you mean on the very _last_ line here. Right?
> 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?
I see a centering but I'm not sure whether I see the same thing
happening as you do. Evaluating
(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 (format "Step 1 at %s wp is %s. Please press a key to
continue." (point) wp))
(dotimes (x (round (/ (window-height) 2)))
(insert (format "more lines ... %s\n" x)))
(read-key (format "Step 2 at %s wp is %s. Please press a key to
continue." (point) wp))
(erase-buffer)
(insert b)
(set-window-point nil wp)
(set-window-start nil p))))
in an empty *scratch* buffer here gives 97..97 and 393..97 for (point)
and wp. Do you see that?
If so then does (setq scroll-conservatively 101) fix it?
martin
- bug#34038: 26.1; set-window-start sometimes fails to set window start, (continued)
- 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, 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,
martin rudalics <=
- 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
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Markus Triska, 2019/01/13
- bug#34038: 26.1; set-window-start sometimes fails to set window start, martin rudalics, 2019/01/13