Marking a Todo should be handled optimistically by js

now I get a hard refresh on marking something a todo, which is not a good experience.

cc @jschatz1 @iamphill @alfredo1

Reassigned to @jschatz1

mentioned in merge request !2946 (merged)

Milestone changed to 8.7

mentioned in commit fa570525

Reassigned to @iamphill

Status changed to closed by merge request !2946 (merged)

mentioned in commit 4cd87d31

mentioned in commit 17d40eab