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

[Drew Adams]

+** New 'pop-up-frames' action alist entry for 'display-buffer'.
+This has the same effect as the variable of the same name and takes
                                 ^^^^^^^^
+precedence over the variable when present.

Please don't do that.  This is a user option,
_not_ just a variable.  (And yes, it should
continue to be supported, forever, regardless
of the fact that it's been "deprecated".)

`display-buffer' shouldn't override the user's
choice for the behavior.

>From my point of view it's OK for a given
command to override a user option, but only
if the command's doc tells users that it does
that.

And a command can do that just by binding the
option to nil.  Please don't let a parameter
to `display-buffer' override this handy, simple
user option.