Handle window insets correctly in the activity_billing.xml layout

Author: DeweyReed

flavor-google/src/main/res/layout/activity_billing.xml

@@ -1,10 +1,9 @@
 <?xml version="1.0" encoding="utf-8"?>
-<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
-    android:fitsSystemWindows="true"
-    android:orientation="vertical">
+    android:fitsSystemWindows="true">
 
     <com.google.android.material.appbar.AppBarLayout
         style="@style/Widget.MaterialComponents.AppBarLayout.PrimarySurface"
@@ -17,15 +16,15 @@
             android:id="@+id/toolbar"
             style="@style/Widget.MaterialComponents.Toolbar.PrimarySurface"
             android:layout_width="match_parent"
-            android:layout_height="?attr/actionBarSize" />
+            android:layout_height="wrap_content" />
 
     </com.google.android.material.appbar.AppBarLayout>
 
     <androidx.fragment.app.FragmentContainerView
         android:id="@+id/fragmentContainerBilling"
         android:name="xyz.aprildown.timer.flavor.google.BillingFragment"
         android:layout_width="match_parent"
-        android:layout_height="0dp"
-        android:layout_weight="1" />
+        android:layout_height="match_parent"
+        app:layout_behavior="@string/appbar_scrolling_view_behavior" />
 
-</LinearLayout>
+</androidx.coordinatorlayout.widget.CoordinatorLayout>