'window-divider-default-places', 'window-divider-default-bottom-width'
and 'window-divider-default-right-width'.
++++
+*** The minibuffer completions window is now displayad at the bottom of
+the selected frame and always fit to its buffer. The Emacs manual
+describes how to customize 'display-buffer-alist' to get back the old
+behavior.
+
---
** Tearoff menus and detachable toolbars for Gtk+ have been removed.
Those features have been deprecated in Gtk+ for a long time.