"To" field doesn't accept further focus requests if keyboard is dismissed while focused

If the "To" field is focused and the user dismisses the keyboard by swiping it down the field remains highlighted but without a cursor and tapping on the field does not give it proper input focus, resulting in the keyboard and the cursor not displaying.

Steps to reproduce:

1) Create a new message

2) Focus on the "To:" field

3) Dismiss the keyboard by swiping down

(Note that the text field is still white)

4) Tap on the "Write a message..." field

5) Tap on the "To:" field

Expected result:

"To:" field accepts input and keyboard is displayed

Actual result:

"To:" field turns white, but doesn't show the cursor or the keyboard.