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vt: implement line selection by double click

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

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

@@ -1013,10 +1013,10 @@

 }

 void

-select(Point p, Point q)

+select(Point p, Point q, int line)

 {

 	if(onscreenr(p.x, p.y) > onscreenr(q.x, q.y)){

-		select(q, p);

+		select(q, p, line);

 		return;

 	}

 	unselect();

@@ -1030,9 +1030,9 @@

 		q.y = ymax;

 		if(!blocksel) q.x = xmax+1;

 	}

-	if(p.x < 0)

+	if(p.x < 0 || line)

 		p.x = 0;

-	if(q.x > xmax+1)

+	if(q.x > xmax+1 || line)

 		q.x = xmax+1;

 	selrect = Rpt(p, q);

 	for(; p.y <= q.y; p.y++)

@@ -1042,18 +1042,22 @@

 void

 selecting(void)

 {

-	Point p;

+	Point p, q;

+	static ulong t;

 	p = pos(mc->xy);

+	t += mc->msec;

 	do{

+		q = pos(mc->xy);

+		select(p, q, t < 200);

 		drawscreen();

 		readmouse(mc);

-		select(p, pos(mc->xy));

 	} while(button1());

 	switch(mc->buttons & 0x7){

 	case 3:	snarfsel();	break;

 	case 5:	paste();	break;

 	}

+	t = -mc->msec;

 }

 int

@@ -1259,7 +1263,7 @@

 	/* move selection */

 	selrect.min.y -= d;

 	selrect.max.y -= d;

-	select(selrect.min, selrect.max);

+	select(selrect.min, selrect.max, 0);

 	clear(0, cy, xmax+1, cy+1);

 }