A computing device with a display simultaneously displays a plurality of user-repositionable user interface objects with one or more activation regions. The device receives a first input from the user. Based at least in part on the first input, the device determines a first plurality of candidate actions for manipulating a user interface object. The device performs a first candidate action of the first plurality of candidate actions as determined in accordance with the first ordering. After performing the first candidate action, the device undoes the first candidate action, receives a third input that is a repetition of the first input, and determines a second plurality of candidate. The second plurality of candidate actions is ordered such that second candidate action in the second plurality of candidate actions has a higher position than the first candidate action in the second ordering. The device performs the second candidate action.