(rmail-new-summary): If just one window,

put the summary in the upper window and Rmail buffer below.

1 files changed, 11 insertions, 1 deletions

diff --git a/lisp/mail/rmailsum.el b/lisp/mail/rmailsum.el
index e5f76821721..985ae19c2bf 100644
--- a/lisp/mail/rmailsum.el
+++ b/lisp/mail/rmailsum.el
@@ -198,7 +198,17 @@ nil for FUNCTION means all messages."
       (setq rmail-summary-buffer sumbuf))
     ;; Now display the summary buffer and go to the right place in it.
     (or was-in-summary
-        (pop-to-buffer sumbuf))
+        (if (one-window-p)
+            ;; If there is just one window, put the summary on the top.
+            (progn
+              (split-window)
+              (select-window (next-window (frame-first-window)))
+              (pop-to-buffer sumbuf)
+              ;; If pop-to-buffer did not use that window, delete that
+              ;; window.  (This can happen if it uses another frame.)
+              (if (not (eq sumbuf (window-buffer (frame-first-window))))
+                  (delete-other-windows)))
+          (pop-to-buffer sumbuf)))
     (rmail-summary-goto-msg mesg t t)
     (message "Computing summary lines...done")))