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

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From: Eli Zaretskii <eliz <at> gnu.org>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: rudalics <at> gmx.at, 1077 <at> debbugs.gnu.org
Subject: bug#1077: 23.0.60; x-create-frame: (wrong-type-argument number-or-marker-p nil)
Date: Tue, 30 Nov 2010 20:16:45 +0200

> From: "Drew Adams" <drew.adams <at> oracle.com>
> Cc: <1077 <at> debbugs.gnu.org>
> Date: Tue, 30 Nov 2010 07:56:55 -0800
> 
> > > But if not entry for `menu-bar-lines' exists, calling
> > > (frame-parameter ... 'menu-bar-lines) returns nil.
> > 
> > That's not guaranteed to be true.  You will see in the implementation
> > of frame-parameter and frame-parameters that we return values for some
> > frame parameters without ever looking at the frame's parameter alist.
> > It's true that frame-parameter actually does look in frame's parameter
> > alist when the value of menu-bar-lines is requested, but
> > frame-parameters does not, at least for TTYs.
> 
> My impression (I don't have references to prove it) is that this general rule
> _has_ worked, and it has only recently (in the last few years) been broken.

Perhaps for a couple of frame parameters that was changed recently.
However, the general fact that _some_ frame parameters are returned
without ever consulting the frame's parameter alist -- this fact is
true for as long as I can remember.

> I'm not aware that there ever was a _frame parameter_ named `menu-bar-mode'.
> Certainly there is none mentioned in the Emacs 20 Elisp manual.  There is a
> `menu-bar-mode' _command_ (and mode).

Every mode (well, almost every one) has a variable by that same name.
Try "C-h v menu-bar-mode RET".  I'm sure you already knew that.

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