IssueTracker

Component used: Navigation Version used: 2.7.4

This request is related to this feature request

Our application also has this issue. Below is our navigation architecture:

| HorizontalPager (beyondBoundsPageCount == pages size) <-- This is key
    | Tab 1..4
    | Tab 5
        | NavHost

Because each tab is composed, we have to track the 'active' tab as to enable/disable the tab's respective BackHandler. However, if I am on tab 2 which is an Ionic Portal (web micro-front-end), when using the BackHandler to handle navigation events, the NavHost on tab 5 receives the events if the currentBackStack.size > 1. We cannot move the BackHandler to be after the NavHost as it will make the BackHandler's within each destination route not consumable.

In addition to this, if we move Tab 5 to a higher order position in the HorizontalPager (say position 1 or 2), this issue does not occur. It's only happening when it's the 'last' tab in the pager. We cannot re-order our tab positions as this is a requirement from our Product Manager.

Furthermore, it would be helpful if the BackHandler/PredictiveBackHandler would check the NavController's enableOnBackPressedCallback. Seems like the simplest approach.