Fixes around text selection

Text selection mode was started by two consecutive taps inside a
field with selectAllOnFocus.

ArrowKeyMovementMethod does not respect the possible cancelLongPress and handles up events.
As a result a scroll that happens to end up at its initial position will be considered a tap
and will move the cursor.
This is however not considered as a tap in TextView and a possible selection mode would not
be stopped in that case.
Fixed by making ArrowKeyMovementMethod aware of the cancel that happened in Touch.

Change-Id: I07372b703f250e1edc7ee0665318ce30441b9187