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vt: fix selrange() to recover whitespace indention

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

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

@@ -915,16 +915,25 @@

 Rune *

 selrange(Rune *r, int x0, int y0, int x1, int y1)

 {

-	Rune *p, *sr, *er;

+	Rune *s, *e;

+	int z, p;

-	p = r;

-	sr = onscreenr(x0, y0);

-	er = onscreenr(x1, y1);

-	for(; sr != er; sr++)

-		if(*sr)

-			*p++ = *sr;

-	*p = 0;

-	return p;

+	s = onscreenr(x0, y0);

+	e = onscreenr(x1, y1);

+	for(z = p = 0; s < e; s++){

+		if(*s){

+			if(*s == '\n')

+				z = p = 0;

+			else if(p++ == 0){

+				while(z-- > 0) *r++ = ' ';

+			}

+			*r++ = *s;

+		} else {

+			z++;

+		}

+	}

+	*r = 0;

+	return r;

 }

 Rune*