bug#13167: 24.3.50; C-x right C-x left interferes with buffer order

[martin rudalics]

> I think that C-x right and C-x left should behave like the "Next" and
> "Prev" buttons in a browser where clicking the "Next" button adds the
> current page to the list of previous pages, removes the first page from
> the list of next pages and displays it.  Clicking the "Prev" button adds
> the current page to the list of next pages, removes the first page from
> the list of previous pages and displays it.

Virtually, that's what the code does.

> It's disturbing that such unobtrusive action can mislead quit-window
> to restore a buffer that was only temporarily shown in that window
> with C-x right C-x left.

But the buffer shown via C-x right might have been shown there for quite
some while.

> I believe C-x right and C-x left should be
> special to not affect the logic of "try taking the buffer that has been
> shown in that window before the present one".

I'm not sure what this means to do instead.  Have `quit-window' not show
a buffer if it appears on `window-next-buffers'?  What happens if you
turn the form

                   (or bury-or-kill (not (memq buffer next-buffers))))

in `switch-to-prev-buffer' into

                   (not (memq buffer next-buffers)))

I have no idea what else this could affect, though.

martin