Android fitsSystemWindows not working when replacing fragments

Question

I have SingleFramgnetActivity whose purpose is only to hold and replace fragments inside it.

layout looks like this:

Answer 1

a) you can use CoordinatorLayout as your root view inside fragment

or

b) you can create custom linear layout what will call requestApplyInsets and use it as your root view inside fragment

class WindowInsetsLinearLayout : LinearLayout {
    constructor(context: Context) : super(context)
    constructor(context: Context, attrs: AttributeSet) : super(context, attrs)
    constructor(context: Context, attrs: AttributeSet, defStyleAttr: Int) : super(context, attrs, defStyleAttr)

    override fun onAttachedToWindow() {
        super.onAttachedToWindow()
        ViewCompat.requestApplyInsets(this)
    }
}

and then inside fragment you can catch applying insets

override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
    super.onViewCreated(view, savedInstanceState)
    ViewCompat.setOnApplyWindowInsetsListener(root_layout) { _, insets ->
        //appbar.setPadding(insets.systemWindowInsetLeft, insets.systemWindowInsetTop, 0, 0)
        insets.consumeSystemWindowInsets()
    }
}