Prevent unwanted resizing when cycling through buffers in a window

(ement-room-compose-buffer-window-auto-height): Do not resize a window
which has just switched from some other buffer to a compose buffer, as
we may in fact be in the middle of cycling through the available
buffers, in which case it would be annoying for the window to suddenly
change size along the way.

ement-room.el

@@ -4472,8 +4472,15 @@ Called via `post-command-hook' if option
   ;; so a more comprehensive solution, while possible, is not worth the added
   ;; complexity -- our relatively simplistic approach is good enough for the
   ;; vast majority of situations.
+
+  ;; Skip resizing if we are being called recursively...
   (unless (or (bound-and-true-p ement-room-compose-buffer-window-auto-height-resizing-p)
-              (window-full-height-p))
+              ;; ...or there are no other windows to resize...
+              (window-full-height-p)
+              ;; ...or we have just switched to this buffer from another buffer
+              ;; (we may be cycling window buffers, and about to switch again).
+              (and (window-old-buffer)
+                   (not (eq (window-old-buffer) (current-buffer)))))
     ;; Manipulate the window body height.
     (let* ((pixelwise (and ement-room-compose-buffer-window-auto-height-pixelwise
                            (display-graphic-p)))