When resetting the subset, repopulate with filtered models from the p…

…arent.

All models in the subset should be the same instance as in the parent
collection. Corrected test to reflect this.

backbone.subset.js

@@ -74,8 +74,10 @@
     this.each(this._unbindModelEvents);
     this._reset();
 
-    _.each(models, function (model) {
-      this._addToSubset(model, {silent: true});
+    this.parent().each(function (model) {
+      if (this.sieve(model)) {
+        this._addToSubset(model, {silent: true});
+      }
     }, this);
 
     if (!options.silent) {

test/test.js

@@ -190,6 +190,6 @@ describe('Aggregated collections', function () {
     assert.deepEqual(tasks.pluck('id'), [0, 4, 5]);
     assert.deepEqual(archived_tasks.pluck('id'), [5]);
     assert.deepEqual(_.pluck(tasks.models, 'cid'), ['c6', 'c8', 'c9']);
-    assert.deepEqual(_.pluck(archived_tasks.models, 'cid'), ['c11']);
+    assert.deepEqual(_.pluck(archived_tasks.models, 'cid'), ['c9']);
   });
 });