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bug#33458: 27.0.50; dired loses position when reverted from outside plac

From: Stephen Berman
Subject: bug#33458: 27.0.50; dired loses position when reverted from outside place
Date: Thu, 22 Nov 2018 10:38:32 +0100
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

On Thu, 22 Nov 2018 12:07:04 +0300 address@hidden wrote:

> Thanks,
> On Wed, Nov 21 2018, Stephen Berman wrote:
>> I assume you used `C-x b' (switch-to-buffer) to switch back.
> No, just close DIR-B buffer or do M-: (previous-buffer).

Ah, ok, didn't think of those.

>> If so, this happens because dired-revert erases and then repopulates
>> the buffer it's called on, which relocates the markers used by
>> switch-to-buffer to find window-point when
>> switch-to-buffer-preserve-window-point is t, which is it by default
>> since Emacs 26.  If you set that variable to nil, point will be where
>> you expected after `C-x b'.
> Now it works for `C-x b' but not for M-: (previous-buffer) of closing
> DIR-B buffer. Point still lost.


>> Alternatively, if you use `C-x d' (i.e. M-x dired) to return to the
>> DIR-A buffer, point will be where you expected (even if
>> switch-to-buffer-preserve-window-point is t).
> Yes, it does, but more consistent behavior needed.

I agree.

>> See bug#27243,
>> https://lists.gnu.org/archive/html/bug-gnu-emacs/2017-06/msg00147.html
> Good explanation, but your patches seems outdated and doesn't work for
> me either.

It seems it's necessary to go back and look at the issue again, taking
your cases into account.  I don't have time to do that now, but will try
to when I can; maybe someone else will find a fix sooner.

Steve Berman

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