Also, scroll after collapsing as well to preserve the header position.
LinearLayoutManager seems to not count/double count the top padding of
the RecyclerView when scrolling to the position. Scrolling with the
offset and deducting the top padding works around the issue.
There's still some occasional weirdness that needs to be investigated,
but this works well...most of the time.
Bug: 183378651
Test: locally
Change-Id: I0ba85fb65411991ef781f08a69faaa993a7d7fd0
Stevie Kideckel
d7dc5702f6