The widget for the default route of the app (Navigator.defaultRouteName,
This is the route that is displayed first when the application is started
normally, unless initialRoute is specified. It's also the route that's
displayed if the initialRoute can't be displayed.
To be able to directly call Theme.of, MediaQuery.of, etc, in the code
that sets the home argument in the constructor, you can use a Builder
widget to get a BuildContext.
If home is specified, then routes must not include an entry for
as home takes its place.
The Navigator is only built if routes are provided (either via home,
routes, onGenerateRoute, or onUnknownRoute); if they are not,
builder must not be null.
The difference between using home and using builder is that the home
subtree is inserted into the application below a Navigator (and thus
below an Overlay, which Navigator uses). With home, therefore,
dialog boxes will work automatically, Tooltips will work, the routes
table will be used, and APIs such as Navigator.push and Navigator.pop
will work as expected. In contrast, the widget returned from builder is
inserted above the MaterialApp's Navigator (if any).
final Widget home