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merge3: align edges of chunks

--- a/merge3.c

+++ b/merge3.c

@@ -63,7 +63,7 @@

 char*

 merge(Diff *l, Diff *r)

 {

-	int il, ir, a, b;

+	int il, ir, a, b, δ;

 	Change *lc, *rc;

 	vlong ln;

@@ -78,10 +78,33 @@

 		if(il < l->nchanges)

 			lc = &l->changes[il];

 		if(ir < r->nchanges)

-			rc = &r->changes[il];

+			rc = &r->changes[ir];

 		if(overlaps(lc, rc)){

-			a = (lc->a < rc->a) ? lc->a : rc->a;

-			b = (lc->b > rc->b) ? lc->b : rc->b;

+			/*

+			 * align the edges of the chunks

+			 */

+			if(lc->a < rc->a){

+				a = lc->a;

+				δ = rc->a - lc->a;

+				rc->a -= δ;

+				rc->c -= δ;

+			}else{

+				a = rc->a;

+				δ = lc->a - rc->a;

+				lc->a -= δ;

+				lc->c -= δ;

+			}

+			if(lc->b > rc->b){

+				b = lc->b;

+				δ = lc->b - rc->b;

+				rc->b += δ;

+				rc->d += δ;

+			}else{

+				b = rc->b;

+				δ = rc->b - lc->b;

+				rc->b += δ;

+				rc->d += δ;

+			}

 			fetch(l, l->ixold, ln, a-1, l->input[0], "");

 			Bprint(&stdout, "<<<<<<<<<< %s\n", l->file2);

 			fetch(l, l->ixnew, lc->c, lc->d, l->input[1], "");