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vt: handle underline attribute

--- a/sys/src/cmd/vt/main.c

+++ b/sys/src/cmd/vt/main.c

@@ -340,6 +340,7 @@

 	uchar *ap, *cp;

 	Image *c;

 	Rune *rp;

+	Point p, q;

 	draw(screen, screen->r, bgcolor, nil, ZP);

@@ -370,9 +371,16 @@

 			ap = onscreena(x, y);

 			cp = onscreenc(x, y);

 			c = fgcol(*ap, *cp);

-			for(n = 1; x+n <= xmax && rp[n] != 0 && fgcol(ap[n], cp[n]) == c; n++)

+			for(n = 1; x+n <= xmax && rp[n] != 0 && fgcol(ap[n], cp[n]) == c

+			&& (ap[n] ^ *ap) & TUnderline == 0; n++)

 				;

-			runestringn(screen, pt(x, y), c, ZP, font, rp, n);

+			p = pt(x, y);

+			q = runestringn(screen, p, c, ZP, font, rp, n);

+			if(*ap & TUnderline){

+				p.y += font->ascent+1;

+				q.y += font->ascent+2;

+				draw(screen, Rpt(p, q), c, nil, ZP);

+			}

 		}

 		if(*onscreenr(x, y) == 0)

 			runestringn(screen, pt(x, y),