FloorFilter - NavigationStack incompatibility

[dfeinzimer]

As of 694, the Floor Filter is broken when used within a NavigationStack. This problem was revealed when the test runner switched from a NavigationView to a NavigationStack in 695.

The Floor Filter uses its own NavigationStack internally. Previously, with the deprecated NavigationView this wasn't an issue. Nested NavigationStacks break patterns we've relied upon:

• 1. The filter's view model is no longer available in the environment.
• 2. If we work around (i) by passing the model directly via parameters we run into the next problem: The facility list seems to loose the filter's NavigationStack and is instead drawn into the user level NavigationStack. The items in the navigation bar (title, back & close buttons, filter) are also moved.

brokenFloorFilter.mov