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sam: include delimiter-pair when extending selection

--- a/sys/src/cmd/sam/moveto.c

+++ b/sys/src/cmd/sam/moveto.c

@@ -142,12 +142,27 @@

 void

 stretchsel(File *f, Posn p1, int mode)

 {

-	int c, i;

-	Rune *r, *l;

+	int c, i, lc, rc;

+	Rune *r, *l, *x;

 	Posn p;

 	if(p1 > f->nc)

 		return;

+	if(mode){

+		lc = f->dot.r.p1 > 0     ? filereadc(f, f->dot.r.p1-1) : '\n';

+		rc = f->dot.r.p2 < f->nc ? filereadc(f, f->dot.r.p2)   : '\n';

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

+			l = left[i];

+			r = right[i];

+			x = strrune(l, lc);

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

+				f->dot.r.p1 -= lc != '\n';

+				f->dot.r.p2++;

+				return;

+			}

+		}

+	}

+

 	f->dot.r.p1 = f->dot.r.p2 = p1;

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

 		l = left[i];

-- 

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