Fix window splitting behavior of 'display-buffer-at-bottom'

* lisp/window.el (display-buffer-at-bottom): Never split an
arbitrary bottom window.  Try to split the frame's main
window instead (Bug#33870).

diff --git a/lisp/window.el b/lisp/window.el
index 424d0525f4e926557b22041261c19edf1822de9d..19f84696e0fb213cf2b99767ed59352c5e215c82 100644 (file)
--- a/lisp/window.el
+++ b/lisp/window.el
@@ -7559,10 +7559,6 @@ selected frame."
      nil nil 'nomini)
     (or (and bottom-window-shows-buffer
             (window--display-buffer buffer bottom-window 'reuse alist))
-       (and (not (frame-parameter nil 'unsplittable))
-            (let (split-height-threshold)
-              (setq window (window--try-to-split-window bottom-window alist)))
-            (window--display-buffer buffer window 'window alist))
        (and (not (frame-parameter nil 'unsplittable))
             (setq window (split-window-no-error (window-main-window)))
             (window--display-buffer buffer window 'window alist))