Added a copy() method on collections

system/src/Grav/Common/Page/Collection.php

@@ -35,6 +35,17 @@ class Collection extends Iterator
         return $this->params;
     }
 
+    /**
+     *
+     * Create a copy of this collection
+     *
+     * @return static
+     */
+    public function copy()
+    {
+        return new static($this->items, $this->params, $this->pages);
+    }
+
     /**
      * Set parameters to the Collection
      *