Allow usage of root navigator for showing picker #288
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In the case that a picker modal is being displayed from a widget which is in a nested navigation controller (for example, if there is a bottom navigation bar), it's helpful to have a useRootNavigator argument on the Picker.showModal method.
This way, when a Picker is displayed from such a widget, it will be shown at the very bottom of the screen, rather than above the bottom navigation bar.