Handle window insets with a new way

For example, switching pages in home should only have scale and alpha animations, but a "translate y" animation shows. This is because Data Binding is triggered later (like "in the next frame"), causing the animation runs before view attribute changes.

This commit introduces WindowInsetsHelper class and use it to handle all window insets. With the help of LayoutInflaterFactory from the previous commit, we can control insets behavior by adding our attributes to the XML and anything is done by WindowInsetsHelper class.

As changes are highly coupling, this commit also contains new ItemDecoration for lists, replacing the random combination of padding and empty drawable. And "fixEdgeEffect" extension for RecyclerView, making edge effects respect padding.

app/src/main/java/com/topjohnwu/magisk/ui/MainActivity.kt

@@ -39,14 +39,6 @@ open class MainActivity : BaseUIActivity<MainViewModel, ActivityMainMd2Binding>(
     override val viewModel by viewModel<MainViewModel>()
     override val navHost: Int = R.id.main_nav_host
 
-    //This temporarily fixes unwanted feature of BottomNavigationView - where the view applies
-    //padding on itself given insets are not consumed beforehand. Unfortunately the listener
-    //implementation doesn't favor us against the design library, so on re-create it's often given
-    //upper hand.
-    private val navObserver = ViewTreeObserver.OnGlobalLayoutListener {
-        binding.mainNavigation.setPadding(0)
-    }
-
     private var isRootFragment = true
 
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -100,8 +92,6 @@ open class MainActivity : BaseUIActivity<MainViewModel, ActivityMainMd2Binding>(
             (currentFragment as? ReselectionTarget)?.onReselected()
         }
 
-        binding.mainNavigation.viewTreeObserver.addOnGlobalLayoutListener(navObserver)
-
         val section = if (intent.action == ACTION_APPLICATION_PREFERENCES) Const.Nav.SETTINGS
         else intent.getStringExtra(Const.Key.OPEN_SECTION)
         getScreen(section)?.navigate()
@@ -121,11 +111,6 @@ open class MainActivity : BaseUIActivity<MainViewModel, ActivityMainMd2Binding>(
         }
     }
 
-    override fun onDestroy() {
-        binding.mainNavigation.viewTreeObserver.removeOnGlobalLayoutListener(navObserver)
-        super.onDestroy()
-    }
-
     override fun onOptionsItemSelected(item: MenuItem): Boolean {
         when (item.itemId) {
             android.R.id.home -> onBackPressed()