xemacs trouble maximizing window

[John Paul Wallington]

> Sorry I'm so late again.

No worries.  Thanks for testing !

>                           It doesn't crash, but it does cause an error:
>
> xemacs-21.4 src/xemacs -vanilla -batch -eval '(mswindows-send-sys-command #xf030)'
> Wrong type argument: console-mswindows-p, #<stream-frame "stream" 0x12c>
> xemacs exiting
> 
> Same when used in tty.  This can be avoided using a frame_type_p test:
> 
>   if (NILP (frame)) 
>     frame = Fselected_frame (Qnil);
>   if (FRAME_TYPE_P (XFRAME (frame), mswindows))
[...]
> Seems to work fine for native windows frames, X11 frames, tty and batch.

Cool !

The Emacs equivalent, `w32-send-sys-command', also errors when the
frame is a Non-Win32 GUI frame (albeit with the message "Non-W32
frame used").

Perhaps this XEmacs `mswindows-send-sys-command' should do likewise
when the FRAME_TYPE_P test is false ?  I'm not sure whether it is
preferable to error or not.  Unless anyone else has an opinion it's
your call.