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rio: handle corner selection for resizing better (thanks cinap)

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

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

@@ -392,13 +392,15 @@

 int

 portion(int x, int lo, int hi)

 {

+	int t;

 	x -= lo;

 	hi -= lo;

-	if(hi < 20)

+	t = min(20, max(1, hi/2));

+	if(hi < t)

 		return x > 0 ? 2 : 0;

-	if(x < 20)

+	if(x < t)

 		return 0;

-	if(x > hi-20)

+	if(x > hi-t)

 		return 2;

 	return 1;

 }

-- 

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