Morgan 74ee010b7b Fix MaterialApp's _navigatorObserver when only builder used (#29413)
Fix MaterialApp's _navigatorObserver so it doesn't cause WidgetApp's assertion to fail when using custom navigator, fixes #18904
2019-04-04 15:02:11 -07:00
..
2019-04-03 12:49:13 -07:00
2019-04-03 12:49:13 -07:00