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Global Navigation Observer #37
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Description
Globally handling Navigation Requests has always been a challenge because the NavigationService can not operate as a Singleton and instead has to work as service Scoped to the Page. This PR introduces a NavigationRequestContext and PubSubEvent that is fired by the NavigationService any time a Navigation Method is executed. Prism.Maui manages to do this using the IEventAggregator, however a new Prism.Maui.Rx package has been added to expose some helpers that encapsulates this as an IObservable.