Bug report

Steps to reproduce

1. Go to Top appbar Standart
   1.1 Disable height .top-app-bar__frame
2. Shrink the window to show the scroll bar
3. Scroll down
4. The top app bar is gone. ok!
5. Enlarge the window so that the scroll bar disappears.
   The top app bar remained unchanged.This is bug.

I am using code like this, at the moment:

window.addEventListener('scroll', () => {
    var element = document.querySelector('body');
    var position = element.getBoundingClientRect();

    // checking whether fully visible
    if(position.top >= 0 && position.bottom <= window.innerHeight) {
        $(topAppBarbar.root).animate({top:0}, 'fast');
        or
        topAppBar.root.style.top = "0";
    }
});

Actual behavior

Expected behavior

Screenshots

Your Environment:

Additional context

Possible solution