Whether the back button pressed should pop the current route and switch to the previous route,
defaults to true.
if false, the back button will trigger app exit.
This is applicable only for Android's back button.
The destination to show when the user taps the NavbarItem
destination also defines the list of Nested destination sand the navbarItem associated with it
if true, navbar will be shown on the left, this property
can be used along with NavbarDecoration.isExtended to make the navbar
adaptable for large screen sizes.
defaults to false.
This callback is invoked, when the user taps the back button
on Android.
Defines whether it is the root Navigator or not
if the method returns true then the Navigator is at the base of the navigator stack
whether the navbar should pop to base route of current tab
when the selected navbarItem is tapped all the routes from that navigator are popped.
feature similar to Instagram's navigation bar
defaults to true.