bug#13066: 24.2.90; setting rmail-summary-window-size causes error

[Glenn Morris]

martin rudalics wrote:

> I can't reproduce that here.  Can you post a backtrace, please.

Debugger entered--Lisp error: (wrong-type-argument stringp nil)
  set-buffer(nil)
  (if was-in-summary nil (if (and (one-window-p) pop-up-windows (not 
pop-up-frames)) (progn (split-window (selected-window) 
rmail-summary-window-size) (select-window (next-window (frame-first-window))) 
(rmail-pop-to-buffer sumbuf) (if (not (eq sumbuf (window-buffer 
(frame-first-window)))) (delete-other-windows))) (rmail-pop-to-buffer sumbuf)) 
(set-buffer rmail-buffer) (let ((total rmail-total-messages)) (if 
(rmail-summary-displayed) (let ((window (selected-window))) (save-excursion 
(unwind-protect (progn (rmail-pop-to-buffer rmail-summary-buffer) (let ... 
nil)) (select-window window)))) (save-current-buffer (set-buffer 
rmail-summary-buffer) (let ((rmail-total-messages total)) nil))) 
(rmail-maybe-display-summary)) (set-buffer rmail-summary-buffer))
  (let (mesg was-in-summary sumbuf) (if (eq major-mode (quote 
rmail-summary-mode)) (setq was-in-summary t)) (save-current-buffer (set-buffer 
rmail-buffer) (setq rmail-summary-buffer (rmail-new-summary-1 desc redo func 
args) sumbuf rmail-summary-buffer mesg rmail-current-message)) (if 
was-in-summary nil (if (and (one-window-p) pop-up-windows (not pop-up-frames)) 
(progn (split-window (selected-window) rmail-summary-window-size) 
(select-window (next-window (frame-first-window))) (rmail-pop-to-buffer sumbuf) 
(if (not (eq sumbuf (window-buffer ...))) (delete-other-windows))) 
(rmail-pop-to-buffer sumbuf)) (set-buffer rmail-buffer) (let ((total 
rmail-total-messages)) (if (rmail-summary-displayed) (let ((window 
(selected-window))) (save-excursion (unwind-protect (progn ... ...) 
(select-window window)))) (save-current-buffer (set-buffer 
rmail-summary-buffer) (let ((rmail-total-messages total)) nil))) 
(rmail-maybe-display-summary)) (set-buffer rmail-summary-buffer)) 
(rmail-summary-goto-msg mesg t t) (rmail-summary-construct-io-menu) (message 
"Computing summary lines...done"))
  rmail-new-summary("All" (rmail-summary) nil)
  rmail-summary()
  call-interactively(rmail-summary nil nil)