Compatability with other widgets / packages

[flixmk]

Hey there :D

First of all: really nice work! It looks really good and is also customizable as hell.

I have one drawback that I want to talk about tho.. I also use a package for a floating search bar (https://pub.dev/packages/material_floating_search_bar) which closes by tapping the back button on Android. This gets prohibited by the PersistenBottomNavBar unfortunatly.

So if you want to use the back button it gets tricky to use it sometimes. Maybe this could be changed in the future or maybe I am just to dumb to use it properly^^