bug#67249: 30.0.50; `same-frame` equivalent for `display-buffer-alist`

[Stefan Monnier via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

>> As `special-display-buffer-names` and friends are nearing the 10 years
>> of being declared obsolete, I noticed that I can't find any replacement
>> for the `same-frame` parameter in `display-buffer-alist`.
> IIRC 'same-frame' had no clear semantics.

In `special-display-*`?

Are you referring to whether it's OK to (re)use a window on another
frame if it shows the buffer already?

Other than this, I don't see what was not clear about its semantics.
And I can't see any reason why we couldn't clarify the semantics.

> As for a new window on the selected frame, use
> 'display-buffer-pop-up-window'.  As for any other window on the
> selected frame, use either ‘display-buffer-use-some-window’ or
> ‘display-buffer-use-least-recent-window’ with a nil 'lru-frames'
> action alist entry.

`same-frame` was not quite like any of those, it said "keep using the
default set of options in the same order of preferences, except that if
at all possible, skip those options which end up displaying the buffer
in another frame".


        Stefan