Bug: Upvote and Downvote functionality (Alternate)

[HudsonLu]

Description:

If I alternate between upvote and downvote several times for a post at a constant pace, it flickers suddenly and briefly performs the opposite action before reverting to the original action or overwriting the last action with a time delay.

How to reproduce

1. Lauch RedReader App.
2. Click on Subscribed Posts.
3. Click on the Messages icon on one of the post listed.
4. Click Upvote and then Downvote several times a constant speed of 60 bpm or higher.

Actual Behavior

Actual.Behavior.UpvoteDownvote.mp4

Expected Behavior

Expected.Behavior.UpvoteDownvote.mp4