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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: |
Sun, 13 Jan 2019 08:32:44 +0100 |
User-agent: |
Emacs/24.5 |
Hi Alan,
thank you for looking into this, I greatly appreciate it!
Alan Mackenzie <acm@muc.de> writes:
> . This is pure speculation, but perhaps because the entire buffer is
> currently off the screen, with point being on the empty last line,
This indeed seems to be a critical factor: an empty last line that
appears as the first line of the window.
The reason I think that is because if you add for example just a single
space to the line, everything works exactly as expected:
(progn
(goto-char (point-max))
(insert "\n")
(dotimes (x (window-height))
(insert (format "%s\n" x)))
(insert " ")
(backward-char 1)
(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))))
Please note the (insert " "). I am using (backward-char 1) to show that
the position of point by itself is not enough to trigger the phenomenon.
Thank you and all the best!
Markus
- 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, 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 <=
- bug#34038: 26.1; set-window-start sometimes fails to set window start, martin rudalics, 2019/01/13
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Eli Zaretskii, 2019/01/13
- bug#34038: 26.1; set-window-start sometimes fails to set window start, martin rudalics, 2019/01/13
- bug#34038: 26.1; set-window-start sometimes fails to set window start, Eli Zaretskii, 2019/01/13
bug#34038: 26.1; set-window-start sometimes fails to set window start, Drew Adams, 2019/01/11