Make available scrolling distance in about header more dynamic

[ZacSweers]

Reported by @hzsweers

Description

Currently it is a fixed value based on available height, but we should factor in how quickly the content will get clipped to fade more aggressively if need be to avoid it.

App

Version: 0.0.1-2-ge5e64e2-dev
Version code: 797

Device details

Make: Google
Model: Pixel
Resolution: 1794x1080
Density: 420dpi (420)
Release: 8.0.0
API: 26

Logs

No logs provided