Fix #544 BottomNavigationView cannot show with scrolling on grandchild RecyclerView

[gen0083]

Issue

• close #544

Overview (Required)

• Disable nested scrolling on grandchild RecyclerView

Layout

This is simplified:

CoordinatorLayout
 +- RecyclerView (scroll toward vertical) : child RecyclerView
      +- SessionHeaderItem
      +- HorizontalSessionsItem = grandchild RecyclerView (scroll toward horizontal)
      : 
     and more
 +- BottomNavigationView

Detail

It's caused by confusing to handle nested scroll event from child and grandchild RecyclerView. We interest only child RecyclerView not grandchild RecyclerView. Grandchild RecyclerView scrolls via horizontal. BottomNavigationView shows/hides via vertical scroll. We don't need to receive nested scroll event from grandchild RecyclerView.

Screenshot

[mhidaka]

Wow!

[mhidaka]

quick fix! thankyou @gen0083