From: martin rudalics <rudalics@gmx.at>
To: Jay Kamat <jaygkamat@gmail.com>
Cc: 29111@debbugs.gnu.org
Subject: bug#29111: 26.0.90; Erc keep-place module broken with new default of switch-to-buffer-preserve-window-point
Date: Sat, 04 Nov 2017 09:36:55 +0100 [thread overview]
Message-ID: <59FD7C27.7090803@gmx.at> (raw)
In-Reply-To: <87zi83xij9.fsf@gmail.com>
> Keep place adds a hook so that, when a new message comes in on a
> non-visible buffer *and* point is at the bottom, point is moved up by
> one line. Doing this means that point stays on the last 'read'
> message. Here's the relevant code from keep-place:
>
>> (defun erc-keep-place (ignored)
>> "Move point away from the last line in a non-selected ERC buffer."
>> (when (and (not (eq (window-buffer (selected-window))
>> (current-buffer)))
>> (>= (point) erc-insert-marker))
>> (deactivate-mark)
>> (goto-char (erc-beg-of-input-line))
>> (forward-line -1)))
You could try to pretend that the position at which the buffer was
previously shown in a window is the position calculated here. Add after
the
(forward-line -1)
something like
;; For all non-minibuffer windows on all frames check whether the
;; current buffer was shown in that window before. If so, update the
;; window point positions stored for the buffer to the position we just
;; calculated.
(dolist (frame (frame-list))
(walk-window-tree
(lambda (window)
(let ((prev (assq (current-buffer) (window-prev-buffers window)))
(next (assq (current-buffer) (window-next-buffers window))))
(when prev
(setf (nth 2 prev) (point-marker)))
(when next
(setf (nth 2 next) (point-marker)))))
frame nil 'nominibuf))
Completely _untested_ so you may have to tweak it appropriately!
> Previously, this worked fine, since moving point on non-visible buffers
> meant the movement persisted till the buffer was next 'shown'. However,
> the new default of `switch-to-buffer-preserve-window-point' ensures that
> point stays wherever it was 'last seen'. I'm not sure how it does it,
> but I think it's saving point when a buffer is hidden and restoring it
> when it's seen again
>
>> (when (and entry
>> (or (eq switch-to-buffer-preserve-window-point t)
>> displayed))
>> ;; Try to restore start and point of buffer in the selected
>> ;; window (Bug#4041).
>> (set-window-start (selected-window) (nth 1 entry) t)
>> (set-window-point nil (nth 2 entry)))
Right. So with the hack above you would set (nth 2 entry) to the value
keep-place calculated.
>> That's a possibility, but it would be too radical to go into 26.1, so
>> I think we should explore the less drastic alternatives first.
>
> I agree with Eli that this is too big of a change at this point, but I
> think this is the best long term solution. Perhaps we could
> `make-variable-buffer-local' on `switch-to-buffer-preserve-window-point'
> when enabling keep-place (later, of course).
I can't yet assess all implications of such a solution so I'd certainly
defer it until all other measures have been exhausted.
>> Since ‘keep-place’ is some sort of a minor mode, enabling it should warn
>> the user about the ‘switch-to-buffer-preserve-window-point’
>> incompatibility. But I'm not familiar with ‘define-erc-module’ so we'd
>> probably need someone knowledgeable to do that.
>
> I think this is probably the best idea before the emacs 26 release. The
> definition of 'keep-place' is currently
>
>> (define-erc-module keep-place nil
>> "Leave point above un-viewed text in other channels."
>> ((add-hook 'erc-insert-pre-hook 'erc-keep-place))
>> ((remove-hook 'erc-insert-pre-hook 'erc-keep-place)))
>
> I think we should be able to simply do something like
>
>> (define-erc-module keep-place nil
>> "Leave point above un-viewed text in other channels."
>> ((add-hook 'erc-insert-pre-hook 'erc-keep-place)
>> ;; poor name, but just an example
>> (erc-check-if-switch-to-buffer-preserve-and-warn))
>> ((remove-hook 'erc-insert-pre-hook 'erc-keep-place)))
>
> I would be happy to submit a patch for this, if the Erc maintainer is
> busy. Does this seem like a good solution, or does anyone see a better
> way around this?
If all else fails let's do that. First please try the proposal above.
martin
next prev parent reply other threads:[~2017-11-04 8:36 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-11-02 3:41 bug#29111: 26.0.90; Erc keep-place module broken with new default of switch-to-buffer-preserve-window-point Jay Kamat
2017-11-02 9:51 ` martin rudalics
2017-11-03 5:54 ` Jay Kamat
2017-11-03 7:58 ` martin rudalics
2017-11-03 8:59 ` Eli Zaretskii
2017-11-03 19:35 ` Jay Kamat
2017-11-04 8:36 ` martin rudalics [this message]
2017-11-18 21:57 ` Jay Kamat
2017-11-20 8:26 ` martin rudalics
2017-11-20 18:02 ` Eli Zaretskii
2017-11-21 9:23 ` martin rudalics
2017-11-21 15:44 ` Eli Zaretskii
2017-11-21 16:25 ` Jay Kamat
2017-11-22 8:21 ` martin rudalics
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