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bug#32825: 27.0.50; Deterministic window management

From: Juri Linkov
Subject: bug#32825: 27.0.50; Deterministic window management
Date: Tue, 30 Oct 2018 23:18:51 +0200
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (x86_64-pc-linux-gnu)

>> That's now something that display-buffer-alist can't do: keep the
>> default action(s), but specify parameters, like a larger
>> window-min-height.  I mean, there is no way to change that value unless
>> you around-advice the whole function.
> The caller of 'display-buffer' could bind 'window-min-height' to
> another value around the call.  But that's a bad idea because it may
> override a user customization and because a high value would not allow
> a window to be created even if other windows would tolerate the lower
> value while a low value would allow other windows to shrink to that
> value as well when a new window is created.
> Couldn't setting a 'window-height' action alist entry help here?
> Maybe with a suitable function?

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
-                 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)
+                   ,@(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

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