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render: cropbox is inheritable

--- a/op.c

+++ b/op.c

@@ -1358,10 +1358,18 @@

 Object*

 pagecropbox(Page *p)

 {

-	Object *o = dictget(p->obj, "CropBox");

-	if(o == &null)

+	Object *page = p;

+	Object *o;

+	while(page != &null){

+		o = dictget(p->obj, "CropBox");

+		if(o != &null)

+			return o;

 		o = dictget(p->obj, "MediaBox");

-	return o;

+		if(o != &null)

+			return o;

+		page = dictget(page, "Parent");

+	}

+	return &null;

 }

 void