Keep most recent items at the top of history menu.

        // Add class name to history store if it's not there already

        var cls = this.parseClassName(token);

        if (cls && this.store.find('cls', cls) === -1) {

        if (cls) {

            // When class already in history remove it and add again.

            // This way the most recently visited items will always be at the top.

            var oldIndex = this.store.find('cls', cls);

            if (oldIndex) {

                this.store.removeAt(oldIndex);

            }

            // Add new item at the beginning

            this.store.insert(0, {cls: cls});

            // Remove items from the end of history if there are too many

            while (this.store.getAt(this.maxHistoryLength)) {

                this.store.removeAt(this.maxHistoryLength);