Summary: If you focus a node and then move activity then the focused nodes will no longer be active. this means that they are automatically collapsed in the tree and the visualizer wont be display it. Previously we didnt spot this and the focus state was wrong. Now we check that all parents are active whenever an update comes from client, if the focused node is no longer active after an update then we remove the focus
Reviewed By: lblasa
Differential Revision: D41548250
fbshipit-source-id: d536e0c466d9002fc53bcb43b9b29c7c7fa23ad2
d9314c3b73