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page: use resizewin() to change window size for gif display

resizewin() has some extra logic making sure the rect doesnt get too big.
rio would otherwise refuse to create the window and the operation will fail
completely.

--- a/sys/src/cmd/page.c

+++ b/sys/src/cmd/page.c

@@ -1241,12 +1241,9 @@

 	if(p->ext == nil)

 		return;

 	snprint(label, sizeof(label), "%s %s", p->ext, p->label);

-	if(p->image){

-		ps = subpt(p->image->r.max, p->image->r.min);

-		ps.x += 24;

-		ps.y += 24;

-	} else

-		ps = subpt(screen->r.max, screen->r.min);

+	ps = Pt(0, 0);

+	if(p->image)

+		ps = addpt(subpt(p->image->r.max, p->image->r.min), Pt(24, 24));

 	drawlock(0);

 	if((fd = p->fd) < 0){

 		if(p->open != popenfile)

@@ -1257,7 +1254,7 @@

 		seek(fd, 0, 0);

 	}

 	if(rfork(RFPROC|RFMEM|RFFDG|RFNOTEG|RFNAMEG|RFNOWAIT) == 0){

-		snprint(buf, sizeof(buf), "-pid %d -dx %d -dy %d", getpid(), ps.x, ps.y);

+		snprint(buf, sizeof(buf), "-pid %d", getpid());

 		if(newwindow(buf) != -1){

 			dupfds(fd, 1, 2, -1);

 			if((fd = open("/dev/label", OWRITE)) >= 0){

@@ -1264,6 +1261,8 @@

 				write(fd, label, strlen(label));

 				close(fd);

 			}

+			if(ps.x && ps.y)

+				resizewin(ps);

 			argv[0] = "rc";

 			argv[1] = "-c";

 			argv[2] = p->ext;

-- 

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