bug#19869: 25.0.50; default-frame-alist: width versus fullheight

[martin rudalics]

> There is some inconsistent behavior when setting the with of new
> frames depending on whether fullheight is specified:
>
>
> (progn
>    (set-face-attribute 'default nil :height 175)
>    (setq default-frame-alist
>          '((width . 100)
>            ;; (fullscreen . fullheight)
>            ))
>    (frame-width (make-frame)))  ==> 100
>
>
> OTOH:
>
> (progn
>    (set-face-attribute 'default nil :height 175)
>    (setq default-frame-alist
>          '((width . 100)
>            (fullscreen . fullheight)
>            ))
>    (frame-width (make-frame))) ==> 63
>
>
> I would expect that the results are equal.

They are here (Gtk+, Lucid, Motif and Windows) so probably your window
manager interferes in some way.  I tried with your second form as my
.emacs and by evaluating it in *scratch* with emacs -Q.

> A related bug was #1522, btw.

I'm not sure.  Doesn't your behavior depend on doing
`set-face-attribute' first?.

Anyway, this gives us a good case for doing some forensics.  Please
evaluate

(setq frame-size-history '(1000))

(defun window-display-history ()
  "..."
  (interactive)
  (with-current-buffer-window
   "*history*" nil nil
   (let ((history (cdr frame-size-history))
         element sizes rest)
     (while history
       (setq element (car history))
       (when (eq (car element) (selected-frame))
         (when (setq sizes (nth 2 element))
           (insert (format "%sx%s -> %sx%s "
                           (nth 0 sizes) (nth 1 sizes)
                           (nth 2 sizes) (nth 3 sizes))))
         (insert (format "%s" (nth 1 element)))
         (when (setq rest (nth 3 element))
           (while rest
             (insert (format " %s" (car rest)))
             (setq rest (cdr rest))))
         (insert "\n"))
       (setq history (cdr history)))))
  'history)

in *scratch* and evaluate your second form (the one where you set
fullheight).  Go to the new frame you created this way, type

M-x: window-display-history

in it and post the contents of the *history* buffer here.

If you want to do the same when that form is in your .emacs we'll have
to proceed in a slightly different way.  Let's do that later.

Thanks, martin