Fixed 'missing glyph doesn't use fontconfig config substitutions' bug
XftFontMatch does display-specific font configuration (commit528241a). Nice. Unfortunately, when we switched from FcFontMatch, we also stopped storing the post-Fc{Config,Default}Substitute FcPattern for future lookups. The result is that if a glyph isn't found in the primary font, secondary font lookups use the original FcPattern, not the configured one. If you have custom fontconfig rules (like me), this can be disappointing. I basically just copied the guts out of XftFontMatch[1] and saved the intermediate configured FcPattern. Could be related to the bug that inspired commit4242027. [1]: https://cgit.freedesktop.org/xorg/lib/libXft/tree/src/xftfont.c
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					@ -3373,16 +3373,32 @@ xgeommasktogravity(int mask)
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int
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					int
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xloadfont(Font *f, FcPattern *pattern)
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					xloadfont(Font *f, FcPattern *pattern)
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{
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					{
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						FcPattern *configured;
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	FcPattern *match;
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						FcPattern *match;
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	FcResult result;
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						FcResult result;
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	XGlyphInfo extents;
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						XGlyphInfo extents;
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	int wantattr, haveattr;
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						int wantattr, haveattr;
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	match = XftFontMatch(xw.dpy, xw.scr, pattern, &result);
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						/*
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	if (!match)
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						 * Manually configure instead of calling XftMatchFont
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						 * so that we can use the configured pattern for
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						 * "missing glyph" lookups.
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						 */
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						configured = FcPatternDuplicate(pattern);
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						if (!configured)
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		return 1;
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							return 1;
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						FcConfigSubstitute(NULL, configured, FcMatchPattern);
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						XftDefaultSubstitute(xw.dpy, xw.scr, configured);
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						match = FcFontMatch(NULL, configured, &result);
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						if (!match) {
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							FcPatternDestroy(configured);
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							return 1;
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						}
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	if (!(f->match = XftFontOpenPattern(xw.dpy, match))) {
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						if (!(f->match = XftFontOpenPattern(xw.dpy, match))) {
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							FcPatternDestroy(configured);
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		FcPatternDestroy(match);
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							FcPatternDestroy(match);
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		return 1;
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							return 1;
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	}
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						}
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					@ -3414,7 +3430,7 @@ xloadfont(Font *f, FcPattern *pattern)
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		strlen(ascii_printable), &extents);
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							strlen(ascii_printable), &extents);
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	f->set = NULL;
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						f->set = NULL;
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	f->pattern = FcPatternDuplicate(pattern);
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						f->pattern = configured;
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	f->ascent = f->match->ascent;
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						f->ascent = f->match->ascent;
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	f->descent = f->match->descent;
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						f->descent = f->match->descent;
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