19. The non-transitory computer readable storage medium of claim 10 , wherein the unitary-movement criteria include a criterion that is met when: liftoff of the contact is detected within a first time period of touchdown of the contact, and the movement of the contact is greater than a first movement threshold but less than a second movement threshold.
19. The non-transitory computer readable storage medium of claim 10 , wherein the unitary-movement criteria include a criterion that is met when: liftoff of the contact is detected within a first time period of touchdown of the contact, and the movement of the contact is greater than a first movement threshold but less than a second movement threshold. 20. The non-transitory computer readable storage medium of claim 19 , wherein the first movement threshold and the second movement threshold are defined in terms of contact movement needed on the touch-sensitive surface to move the selection-indicator by a single UI element in the user interface.