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rio: include delimiter-pair when extending selection

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

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

@@ -1089,9 +1089,24 @@

 static void

 wstretchsel(Window *w, uint pt, uint *q0, uint *q1, int mode)

 {

-	int c, i;

+	int c, i, rc, lc;

 	Rune *r, *l, *p;

 	uint q;

+

+	if(mode){

+		lc = *q0 > 0     ? w->r[*q0-1] : '\n';

+		rc = *q1 < w->nr ? w->r[*q1]   : '\n';

+		for(i=0; left[i]; i++){

+			l = left[i];

+			r = right[i];

+			p = strrune(l, lc);

+			if(p && r[p-l] == rc){

+				*q0 -= lc != '\n';

+				(*q1)++;

+				return;

+			}

+		}

+	}

 	*q0 = pt;

 	*q1 = pt;

-- 

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