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rio: fix onscreen()

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

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

@@ -364,8 +364,6 @@

 Rectangle

 whichrect(Rectangle r, Point p, int which)

 {

-	p.x = min(p.x, screen->clipr.max.x-1);

-	p.y = min(p.y, screen->clipr.max.y-1);

 	switch(which){

 	case 0:	/* top left */

 		r = Rect(p.x, p.y, r.max.x, r.max.y);

@@ -842,9 +840,9 @@

 onscreen(Point p)

 {

 	p.x = max(screen->clipr.min.x, p.x);

-	p.x = min(screen->clipr.max.x, p.x);

+	p.x = min(screen->clipr.max.x-1, p.x);

 	p.y = max(screen->clipr.min.y, p.y);

-	p.y = min(screen->clipr.max.y, p.y);

+	p.y = min(screen->clipr.max.y-1, p.y);

 	return p;

 }

-- 

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