App level UINode build is called many times #20

Testing the sky framework now with the stocks example. I added a print() statement to build() fn in stocks_app and discovered that it is printed close to 30 times in logcat:

05-18 12:51:30.268: I/chromium(8515): [INFO:builtin_natives.cc(144)] CONSOLE: Building the app node
05-18 12:51:30.330: I/chromium(8515): [INFO:builtin_natives.cc(144)] CONSOLE: Building the app node
05-18 12:51:30.410: I/chromium(8515): [INFO:builtin_natives.cc(144)] CONSOLE: Building the app node
05-18 12:51:30.481: I/chromium(8515): [INFO:builtin_natives.cc(144)] CONSOLE: Building the app node
05-18 12:51:30.563: I/chromium(8515): [INFO:builtin_natives.cc(144)] CONSOLE: Building the app node
05-18 12:51:30.619: I/chromium(8515): [INFO:builtin_natives.cc(144)] CONSOLE: Building the app node
...

Just filing an FYI bug. I expected this to show up only once:

  UINode build() {
    print("Building the app node");
    List<UINode> overlays = [];
    addMenuToOverlays(overlays);
    _scaffold = new Scaffold(
      header: _isSearching ? buildSearchBar() : buildActionBar(),
      content: new Stocklist(stocks: _stocks, query: _searchQuery, app: this),
      fab: new FloatingActionButton(
        content: new Icon(type: 'content/add_white', size: 24), level: 3),
      drawer: buildDrawer(),
      overlays: overlays
    );
    return _scaffold;
  }