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From: "Jan D." <jan.h.d@swipnet.se>
Newsgroups: gmane.emacs.devel
Subject: Re: x-create-frame is sluggish
Date: Mon, 11 Oct 2004 21:51:10 +0200
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> +   /* See if there is another frame already using same fontset. */
> +   FOR_EACH_FRAME (rest, frame)
> +     {
> +       struct frame *cf = XFRAME (frame);
> +       if (cf != f && FRAME_LIVE_P (f) && FRAME_X_P (cf)
> +           && FRAME_X_DISPLAY_INFO (cf) == FRAME_X_DISPLAY_INFO (f)
> +           && !strcmp (FRAME_XIC_BASE_FONTNAME (cf), base_fontname))
> +         return FRAME_XIC_FONTSET (cf);

You should use FRAME_X_DISPLAY, not FRAME_X_DISPLAY_INFO everywhere.
A frame can be opened on display ":0", "unix:0", "hostname:0" and so on,
but it is still the same display.  However, they will have different 
display
info.

	Jan D.