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* bug#13248: 24.2.50; select-window moves point (in comint-postoutput-scroll-to-bottom)
@ 2012-12-21 13:14 Vitalie Spinu
  2012-12-21 14:25 ` martin rudalics
  0 siblings, 1 reply; 10+ messages in thread
From: Vitalie Spinu @ 2012-12-21 13:14 UTC (permalink / raw)
  To: 13248



Hi, 

I am struggling with a-not-so-easily reproducible bug that occurs only
with ESS when sending input from a buffer to a sub-process. 

Whenever I send a string to a subprocess, the point in process buffer
jumps to the middle of the buffer, instead of staying at the
process-mark at eob, where it supposed to be. And this is not ESS
problem.

Here is what I found during my investigation.  It happens with
(select-window w) in the `comint-postoutput-scroll-to-bottom'
(reproduced below). I was monitoring the value of the (point) just
before and after it, and it looks like this:

 before (point):9943
 after  (point):8619

So the point is clearly moved in select-window. Moreover the (point)
equals (window-end) just before select-window is called, so it is
visible. Consequently, the following (comint-adjust-point selected) is
completely screwed because it relies on point *not* being moved!  

Here is a relevant piece of `comint-postoutput-scroll-to-bottom'


╭──────── #2124 ─ /home/vitoshka/TVC/emacs/lisp/comint.el ──
│ 	    (dolist (w (get-buffer-window-list current nil t))
│ 	      (select-window w)
│ 	      (unwind-protect
│ 		  (progn
│ 		    (comint-adjust-point selected)
│ 		    ;; Optionally scroll to the bottom of the window.
│ 		    (and comint-scroll-show-maximum-output
│ 			 (eobp)
│ 			 (recenter (- -1 scroll-margin))))
│ 		(select-window selected))))))
│       (set-buffer current))))
╰──────── #2134 ─


The variable `comint-scroll-show-maximum-output' is the default t, this
is why comint runs `comint-postoutput-scroll-to-bottom' in its
`comint-output-filter-functions'.

I can propose a patch for commit to reset the point, but it looks like
there is something much more fundamental going on in here.

    Thanks, 
    Vitalie



====================================================================

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  auto-encryption-mode: t
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  column-number-mode: t
  line-number-mode: t
  transient-mark-mode: t
  hs-minor-mode: t

Recent input:
C-p C-p C-u C-M-x <down-mouse-1> <mouse-1> C-n C-SPC 
C-n C-n C-c C-r c c c C-o C-o M-> C-o <help-echo> <down-mouse-1> 
<mouse-1> <down-mouse-1> <mouse-1> C-M-p C-p C-p C-p 
C-p C-p C-p C-p C-SPC C-n C-n C-c C-r n n n n n n n 
n n n n n n n n n n n n n n n n n n n n n n n n n n 
n n n n n n n n n n n n n n n n n n n n n n n n n n 
n n n n n n n C-p C-p C-SPC C-n C-n C-c C-r n n n n 
n n n n n n n n n n n n n n n n n n n n n n n n n n 
n n n n n n n n n n n n n n n n n n n n n n n n n n 
n n n n n n n n n n n C-a <return> C-p C-p C-p C-e 
C-n C-n C-o C-x C-f ~ / t v <return> e m a c <return> 
<return> c o m i <return> M-o s c r o l <return> M-o 
s c r o C-SPC o u t C-s <return> M-k M-k M-k M-k M-k 
M-k M-k C-n C-n C-n C-n C-n C-n C-n C-SPC C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n M-x k i l <return> 
C-x b C-g M-x e s s - v e r <return> M-x v e r s <return> 
M-x b u g - r e <M-backspace> <M-backspace> s e n d 
C-SPC b u g C-g M-x e m a c s C-SPC b u g <return>

Recent messages:
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Opening TLS connection with `gnutls-cli --insecure -p 993 imap.gmail.com'...failed
Opening TLS connection with `gnutls-cli --insecure -p 993 imap.gmail.com --protocols ssl3'...failed
Opening TLS connection with `openssl s_client -connect imap.gmail.com:993 -no_ssl2 -ign_eof'...done
Opening TLS connection to `imap.gmail.com'...done
Auto-saving...
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^ permalink raw reply	[flat|nested] 10+ messages in thread

end of thread, other threads:[~2013-01-02  8:03 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2012-12-21 13:14 bug#13248: 24.2.50; select-window moves point (in comint-postoutput-scroll-to-bottom) Vitalie Spinu
2012-12-21 14:25 ` martin rudalics
2012-12-21 14:38   ` Vitalie Spinu
2012-12-21 14:48   ` Vitalie Spinu
2012-12-22 10:18     ` martin rudalics
2012-12-25  0:18   ` bug#13248: [PATCH] " Vitalie Spinu
2012-12-25 18:09     ` martin rudalics
2012-12-25 22:28       ` Vitalie Spinu
2012-12-27  7:36         ` martin rudalics
2013-01-02  8:03           ` martin rudalics

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