"Pull to refresh" banner disappears if I scroll to the bottom of the list

[Akshat-Agarwal]

I am able to implement pull to refresh, however sometimes if I navigate to the bottom of the list (or sometimes if I scroll really slowly towards the bottom) and then come back to the top I can no longer pull to refresh, the "pull to refresh" banner doesnt show up even if I pull down.

[jmgirven]

I have added issue #42. The two issues may be the same. Can you check if my solution helps to fix yours please?