bug#4041: 23.0.92; Emacs 23: buffer point is no longer frame-local

[Eli Zaretskii <eliz@gnu.org>]

> Date: Sat, 08 Oct 2011 17:00:42 +0200
> From: martin rudalics <rudalics@gmx.at>
> CC: stevey@google.com, larsi@gnus.org, 4041@debbugs.gnu.org
> 
>  > So I don't think switch-to-next/prev-buffer can be a convenient
>  > solution to this problem.
> 
> Did you try it in practice?

Of course, I did.  What makes you think I didn't?

> With some convenient binding?

How inconvenient can "M-x <up> RET" be?

> In my experience, the buffer isn't too far away, usually.

Maybe so, but I don't want to waste my time wading through buffers I
am not interested in.  If I need to see dispextern.h, I want to get
there, pronto.

>  > What is necessary is a way to switch to a buffer by name and have the
>  > window remember its previous window-point.  If the buffer was never
>  > displayed in this window, "C-x b" should choose some value of
>  > window-point that was used before and is not already displayed in some
>  > other window.  (If there's a window for every possible value of
>  > window-point for the buffer, i.e. the user opens yet another window
>  > with the same buffer, just choose one of the values, e.g., the first
>  > or the last.)  For the important use case of having 2 windows with the
>  > same buffer, this strategy will do _exactly_ what the user wants.
> 
> Using the window-point from some other window will be utterly
> disconcerting if you later want to display the buffer in _that_ other
> window.

Are you talking about the rare case in parentheses?  That's a marginal
use case.  Let's not destroy convenience in 90% of cases for the sake
of 10%.

> Recording window-points of deleted windows to implement the "used
> before" approach might be expensive - these are markers into that
> buffer.

So let's record only a few, up to a limit.  Again, having a lot of
such deleted windows is a rare case.

>  > Yes, but it works satisfactorily only if you switch between 2 buffers
>  > in the same window.  Switch to a third, and you are screwed.
> 
> Try them.

I did, before I responded.