gistfile1.js

    onFilterComplete_: function(collection){
      if( this.isLoaded() && !this.loading_ ){

        var newItems = _.difference(
          _.pluck(collection.models, 'cid'),
          _.keys(this.itemCardViews_)
        );

        // empty collections or collections with any unrendered items should be
        // re-rendered, otherwise return early
        if( collection.length !== 0 &&
            this.renderCount_ === collection.length &&
            newItems.length === 0
          ){
          return;
        }

        console.debug(this.cid + ' re-rendering due to filter change');

        this.renderCount_ = 0;
        this.$('.items.main').empty();
        this.renderItemList_();
      }
    },