tree 58a5266d6b33ed39293a2e617d495d0f9db92312
parent 0302ebcf193ed25266c03024698d8418c4620bee
author Dhruv Srivastava <dhruvsri@google.com> 1563277802 +0200
committer Dhruv Srivastava <dhruvsri@google.com> 1563449146 +0200

Only poll for checks if tab is in focus

Allows check state chip and table to refresh automatically only if the checks tab is
in focus.
Fix issues from rolled back commit : I999144dcc
  * ensure multiple listeners are not added
  * unsubscribe listener when component is detached
  * clear polling intervals when component is detached

Change-Id: Iaad5a54878b99f8f544176045acc19e073939f3c