Lazy fontset loading.

Thanks Johannes Hofmann <Johannes.Hofmann@gmx.de>!

st.c

@@ -363,6 +363,7 @@ static void xloadcols(void);
 static int xsetcolorname(int, const char *);
 static int xloadfont(Font *, FcPattern *);
 static void xloadfonts(char *, int);
+static int xloadfontset(Font *);
 static void xsettitle(char *);
 static void xresettitle(void);
 static void xseturgency(int);
@@ -2643,16 +2644,12 @@ xloadfont(Font *f, FcPattern *pattern) {
 	if(!match)
 		return 1;
 
-	if(!(f->set = FcFontSort(0, match, FcTrue, 0, &result))) {
-		FcPatternDestroy(match);
-		return 1;
-	}
-
 	if(!(f->match = XftFontOpenPattern(xw.dpy, match))) {
 		FcPatternDestroy(match);
 		return 1;
 	}
 
+	f->set = NULL;
 	f->pattern = FcPatternDuplicate(pattern);
 
 	f->ascent = f->match->ascent;
@@ -2727,6 +2724,15 @@ xloadfonts(char *fontstr, int fontsize) {
 	FcPatternDestroy(pattern);
 }
 
+int
+xloadfontset(Font *f) {
+	FcResult result;
+
+	if(!(f->set = FcFontSort(0, f->pattern, FcTrue, 0, &result)))
+		return 1;
+	return 0;
+}
+
 void
 xunloadfonts(void) {
 	int i, ip;
@@ -2987,7 +2993,6 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
 	r.width = width;
 	XftDrawSetClipRectangles(xw.draw, winx, winy, &r, 1);
 
-	fcsets[0] = font->set;
 	for(xp = winx; bytelen > 0;) {
 		/*
 		 * Search for the range in the to be printed string of glyphs
@@ -3045,6 +3050,10 @@ xdraws(char *s, Glyph base, int x, int y, int charlen, int bytelen) {
 
 		/* Nothing was found. */
 		if(i >= frclen) {
+			if(!font->set)
+				xloadfontset(font);
+			fcsets[0] = font->set;
+
 			/*
 			 * Nothing was found in the cache. Now use
 			 * some dozen of Fontconfig calls to get the