bug#32825: 27.0.50; Deterministic window management

[martin rudalics]

> I still don't understand why it's impossible to support such uses?
>
> diff --git a/lisp/emacs-lisp/debug.el b/lisp/emacs-lisp/debug.el
> index 7fc2b41c70..6d72616dbc 100644
> --- a/lisp/emacs-lisp/debug.el
> +++ b/lisp/emacs-lisp/debug.el
> @@ -239,11 +239,13 @@ debug
>          (pop-to-buffer
>           debugger-buffer
>           `((display-buffer-reuse-window
> -            display-buffer-in-previous-window)
> -           . (,(when (and (window-live-p debugger-previous-window)
> -                          (frame-visible-p
> -                           (window-frame debugger-previous-window)))
> -                 `(previous-window . ,debugger-previous-window)))))
> +            display-buffer-in-previous-window
> +            display-buffer-below-selected)
> +           . ((window-min-height . 10)

What would the semantics of that 'window-min-height' entry be?

(1) When splitting a window, the new window must be at least 10 lines
    high.

(2) When splitting a window, both the old and the new window must be
    at least 10 lines high after the split.

(3) When splitting a window, every window must be at least 10 lines
    high after the split.

And what would we do if before the split a window is less high than 10
lines?

Why can't we just follow the doc-string of 'window-min-height'?

   Applications should never rebind this variable.  To resize a
   window to a height less than the one specified here, an
   application should instead call ‘window-resize’ with a non-nil
   IGNORE argument.  In order to have ‘split-window’ make a window
   shorter, explicitly specify the SIZE argument of that function.

> +              ,@(when (and (window-live-p debugger-previous-window)
> +                           (frame-visible-p
> +                            (window-frame debugger-previous-window)))
> +                  `((previous-window . ,debugger-previous-window))))))
>          (setq debugger-window (selected-window))
>          (if (eq debugger-previous-window debugger-window)
>              (when debugger-jumping-flag

martin