GNU bug report logs - #1077
23.0.60; x-create-frame: (wrong-type-argument number-or-marker-p nil)

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From: martin rudalics <rudalics <at> gmx.at>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: 1077 <at> debbugs.gnu.org, drew.adams <at> oracle.com
Subject: bug#1077: bug#670: bug#1077: 23.0.60; x-create-frame: (wrong-type-argument number-or-marker-p nil)
Date: Sun, 28 Nov 2010 15:12:53 +0100

>> The menu-bar-lines indications appear inconsistent for stand-alone
>> minibuffer frames.  If I do
>>
>> (let ((frame (make-frame '((minibuffer . only)))))
>>    (frame-parameter frame 'menu-bar-lines))
>>
>> the frame I create doesn't have a menubar but the frame parameter says
>> there's one such line.
>
> Can you see how this inconsistency could explain the (> nil 0) thing
> that burps?  When there's no menubar, the menu-bar-lines parameter
> should be zero, not nil, right?

Not from this observation whose purpose was only to point at the
inconsistency.  But from Nick's fix cited earlier I deduce that
(frame-parameter ... 'menu-bar-lines) apparently can return nil.

Looking at dframe.el I find

		(let* ((mh (dframe-frame-parameter dframe-attached-frame
						   'menu-bar-lines))
		       ...
			   (list (cons 'height (+ (or mh 0) (frame-height)))))))

so somehow mh can be nil - IIUC the value returned by
`dframe-frame-parameter' is that of `frame-parameter'.

So one would have to look at things like

(define-key menu-bar-showhide-menu [menu-bar-mode]
  `(menu-item ,(purecopy "Menu-bar") toggle-menu-bar-mode-from-frame
	      :help ,(purecopy "Turn menu-bar on/off")
	      :button (:toggle . (> (frame-parameter nil 'menu-bar-lines) 0))))

and friends whether they could be the culprits.  But it's also
possible that Drew's code calls `frame-parameter'.

martin

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