1. The NumberPicker was showing the IME if the input field
gets focus and hiding it when the the arrows are pressed.
The leads to a nasty behavior when the input is the first
focusable and the uses presser an arrow button. In such
a case the IME shows and hides on every arrow press pushing
the window content up and down - this looks pretty ugly.
Now the IME is show on double tap of the input field.
2. The NumberPicker input now by default has an IME action
done, hence after editing it the IME goes away.
3. The NumberPicker input now clears focus when it gets
IME action done, so the last picker in a sequence
does not show selection which is focus driven.
4. NumberPicker was incorrectly detecting double tap to
begin edit and it was possble to start edit on singe tap
if the user has double tapped before to start an edit.
Now double tap detection is using the double tap timeout
correctly.
bug:6071977
Change-Id: I0ff5a491064e51663b3abec675d839d0a65b986a
a2b41b438d