Scroll position moves automatically when timestamps are updated

[ssawchenko]

Found on my Nexus 5 Running 6.0.1 (but I have seen this on other devices as well)

I have noticed an issue where whenever the timestamps are to be updated, the scroll position in the recyclerview will change, such that it seems to push the user "up" the list. You can see this issue more pronounced by changing the timestamps to update every 5 seconds (instead of 62) and always forcing the notifyItemChanged to be called.

Digging around it appears it may be an issue with RecyclerView itself (https://code.google.com/p/android/issues/detail?id=203574)

=== My Fix ===
I have made some changes to our forked repo that tries to circumvent the problem.

• mRecyclerView.setHasFixedSize(true); // Fixes redraw resize issue that was forcing a scroll position change.
• mRecyclerView.getItemAnimator().setChangeDuration(0); // Removes flicker happening on notifyItemChanged redraw.

It still needs testing, and the animation now doesn't look as nice when adding new chats, but the scrolling bug appears to be solved by this.

If I have time I will look at making a PR against the lib with these changes.

[jchunchar]

Nice catch -- definitely feel free to make a PR with your fix!