Flushbar should consider bottomNavbar

[fayaz07]

Describe the bug
Flushbar(snackbar) should consider the bottomNavbar and show flushbar or snackbar above the bottomNavbar if it's present.

**Screenshots **
A demo how it should be, video

It is currently like this

[MustafaAdam]

Came here to post the same thing.
i have a flushbar that shows up immediately after login. I want the user to use the navigation bar and not be disturbed by the flushbar.
The flushbar should indeed consider not only the bottom navigation bar but also the appbar when the flushbar position is at the top.

[Janaka-Steph]

Similar to #69
Seems like there is no good solution :(

[jagadish-pattanaik]

same here I got really confused that it is working or not and came here to search for that, no I understood that it's getting behind the app bar and navigation bar that's why it's not visible...please solve this problem quickly.