Handle dynamic ViewPager2 page height

Fragment.kt

class Fragment() { 

   private fun initViews() = with(binding) {
        pager.setPageTransformer { page, pos ->
            if (pos == 0.0F) {
                updatePagerHeightForChild(page, pager)
            }
        }
    }

}

ViewPagerExt.kt

import android.graphics.Rect
import android.view.View
import androidx.core.view.doOnLayout
import androidx.core.view.updateLayoutParams
import androidx.viewpager2.widget.ViewPager2

fun updatePagerHeightForChild(view: View, pager: ViewPager2) {
    view.post {
        val wMeasureSpec = View.MeasureSpec.makeMeasureSpec(view.width, View.MeasureSpec.EXACTLY)
        val hMeasureSpec = View.MeasureSpec.makeMeasureSpec(0, View.MeasureSpec.UNSPECIFIED)
        view.measure(wMeasureSpec, hMeasureSpec)

        view.doOnLayout {
            val pageVisibleRect = Rect().also {
                view.getGlobalVisibleRect(it)
            }
            val pageVisibleHeight = pageVisibleRect.height()
            val pageActualHeight = view.measuredHeight

            val pagerVisibleRect = Rect().also {
                pager.getGlobalVisibleRect(it)
            }
            val pagerVisibleHeight = pagerVisibleRect.height()

            val rootVisibleRect = Rect().also {
                pager.rootView.getGlobalVisibleRect(it)
            }
            val rootVisibleHeight = rootVisibleRect.height()

            val isPageSmallerThanAvailableHeight =
                pageActualHeight <= pageVisibleHeight && pagerVisibleHeight <= rootVisibleHeight

            if (isPageSmallerThanAvailableHeight) {
                pager.updateLayoutParams {
                    height = pagerVisibleRect.bottom - pageVisibleRect.top
                }
            } else {
                pager.updateLayoutParams {
                    height = pageActualHeight
                }
            }
            pager.invalidate()
        }
    }
}