martin rudalics <rudalics@gmx.at> writes:

> Sorry, no.  Please assert first that the backsizing gets done inside the
> following chunk:
>
>       (when (and (listp quad)
> 		 (integerp (nth 3 quad))
> 		 (> (nth 3 quad) (window-total-height window)))
> 	(condition-case nil
> 	    (window-resize window (- (nth 3 quad) (window-total-height window)))
> 	  (error nil)))
>
> Then we can try to find out who created that quad before and why.

I put some messaging in that code, and it is indeed that bit that does
the resizing.

Here's a reproducer from emacs -Q:

(progn
  (setq display-buffer-alist '((".*" display-buffer-use-least-recent-window)))
  (pop-to-buffer "file1")
  (pop-to-buffer "file2")
  (split-window-below)
  (pop-to-buffer "file3"))

I end up with the following, and file3 in an oddly large window.