> And note one thing: When you call 'get-lru-window' twice in a row, it
 > will usually _not_ return a window it has internally considered as
 > "second best" provided it finds a best one.
 >
 > Consider a frame with three windows, one of them full width and the
 > other two, including the selected one, not full width.  In this case
 > 'get-lru-window' will always return the full width window even if it has
 > a higher use time than the not selected, not full width one.

A tentative solution for this and the other problems mentioned in this
thread is in the attached diff.  It should be able to digest the
following form.

(let* ((window (selected-window))
        use-time)
   ;; Make window at bottom mru.
   (select-window (split-window))
   ;; Make window on right mru.
   (select-window (split-window window nil t))
   ;; Make initial window mru so the lru window is the one at bottom.
   (select-window window)
   (setq use-time (window-use-time))
   (display-buffer
    (get-buffer-create "*foo*")
    `((display-buffer-use-least-recent-window)
      (window-min-width . full-width)
      (lru-time . ,use-time)
      ))
   (display-buffer
    (get-buffer-create "*bar*")
    `((display-buffer-use-least-recent-window)
      (window-min-width . full-width)
      (lru-time . ,use-time)
      )))

Note how it uses a non-full-width window for *bar* despite the fact that
we would have preferred a full-width one.  And note the settings of
lru-time to the use time of the selected window before the first
'display-buffer' call.  Commenting out these lru-time settings will make
it use as window for *bar* the window it previously used for *foo*.

martin