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rio: properly handle initial wrap arround in wlook()

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

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

@@ -900,6 +900,9 @@

 	if(n <= 0 || e < n)

 		return;

+	if(i > e)

+		i = 0;

+

 	while(runestrncmp(w->r+w->q0, w->r+i, n) != 0){

 		if(i < e)

 			i++;