Use WindowInsetsCompat for navigation bar height

[latidoremi]

getNavigationBarHeight() and isNavigationBarVisible() can return incorrect values on some devices in gesture navigation mode, leading to wrong keyboard height calculation

On the Huawei v40 lite I have:

• Gesture navigation + indicator bar disabled

  • Original code: height = 38, visible = true
  • Correct values: height = 0, visible = false

• Gesture navigation + indicator bar enabled

  • Original code: height = 16
  • Correct value: height = 38

• Button navigation

  • Original code returns the correct height of 38

I propose switching to WindowInsetsCompat to retrieve the navigation bar height:

val insets = ViewCompat.getRootWindowInsets(rootView)
val navigationBarHeight = insets?.getInsets(WindowInsetsCompat.Type.navigationBars())?.bottom ?: 0
val isNavigationBarVisible = insets?.isVisible(WindowInsetsCompat.Type.navigationBars()) ?: false

This returns the correct values on all devices I tested (Huawei V40 Lite, Redmi K70, Samsung S9)

This may also fix #11

[latidoremi]

I also tuned down the threadshold that triggers the event, when using the google Gboard voice typing mode, you can half collapse the keyboard and the keyboard height can get pretty low, 0.15 is too high for that