Introduce Base.filter(), to copy and filter object properties.

src/core/Base.js

@@ -76,24 +76,9 @@ Base.inject(/** @lends Base# */{
      * Base.isPlainObject() check on props or not
      * @return {Boolean} {@true if the object is a plain object}
      */
-    _set: function(props, exclude, dontCheck) {
-        if (props && (dontCheck || Base.isPlainObject(props))) {
-            // If props is a filtering object, we need to execute hasOwnProperty
-            // on the original object (it's parent / prototype). See _filtered
-            // inheritance trick in the argument reading code.
-            var keys = Object.keys(props._filtering || props);
-            for (var i = 0, l = keys.length; i < l; i++) {
-                var key = keys[i];
-                if (!(exclude && exclude[key])) {
-                    // Due to the _filtered inheritance trick, undefined is used
-                    // to mask already consumed named arguments.
-                    var value = props[key];
-                    if (value !== undefined)
-                        this[key] = value;
-                }
-            }
-            return props;
-        }
+    _set: function(props) {
+        if (props && Base.isPlainObject(props))
+            return Base.filter(this, props);
     },
 
     statics: /** @lends Base */{
@@ -308,6 +293,29 @@ Base.inject(/** @lends Base# */{
             return !!this.getNamed(list, name);
         },
 
+        /**
+         * Copies all properties from `source` over to `dest`, supporting
+         * _filtered handling as required by Base.readNamed() mechanism, as well
+         * as an optional exclude` object that lists properties to exclude.
+         */
+        filter: function(dest, source, exclude) {
+            // If source is a filtering object, we need to get the keys from the
+            // the original object (it's parent / prototype). See _filtered
+            // inheritance trick in the argument reading code.
+            var keys = Object.keys(source._filtering || source);
+            for (var i = 0, l = keys.length; i < l; i++) {
+                var key = keys[i];
+                if (!(exclude && exclude[key])) {
+                    // Due to the _filtered inheritance trick, undefined is used
+                    // to mask already consumed named arguments.
+                    var value = source[key];
+                    if (value !== undefined)
+                        dest[key] = value;
+                }
+            }
+            return dest;
+        },
+
         /**
          * Returns true if obj is either a plain object or an array, as used by
          * many argument reading methods.

src/item/Item.js

@@ -150,10 +150,9 @@ new function() { // // Scope to inject various item event handlers
         if (hasProps && props !== Item.NO_INSERT) {
             // Filter out internal, insert, parent and project properties as
             // these were handled above.
-            this._set(props,
-                { internal: true, insert: true, project: true, parent: true },
-                // Don't check for plain object, as that's handled by hasProps.
-                true);
+            Base.filter(this, props, {
+                internal: true, insert: true, project: true, parent: true
+            });
         }
         return hasProps;
     },
@@ -2031,7 +2030,7 @@ new function() { // // Scope to inject various item event handlers
                 if (obj) {
                     // Create a copy of the match object that doesn't contain
                     // these special properties:
-                    match = new Base()._set(match, {
+                    match = Base.filter({}, match, {
                         recursive: true, inside: true, overlapping: true
                     });
                 }

test/tests/Item_Getting.js

@@ -207,3 +207,21 @@ test('Project#getItems() empty: true', function() {
         }).length;
     }, 2);
 });
+
+test('Project#getItems() overlapping', function() {
+    var path = new Path.Circle({
+        radius: 100,
+        center: [200, 200],
+        fillColor: 'red'
+    });
+
+    var rect = new Rectangle(0, 0, 400, 400);
+
+    equals(function() {
+        var matches = project.getItems({
+            class: Path,
+            overlapping: rect
+        });
+        return matches.length == 1 && matches[0] == path;
+    }, true);
+});