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Don't hide end call button until call is disconnected
Currently, the end call button is hidden the moment the user initates a hangup. In the event that the call is not actually disconnected, the UI is stuck in a "Hanging up" state that is unresponsive For the majority of calls that disconnect correctly, there should be no user-perceptible difference in behavior. For calls that are not disconnected correctly, the end call button will remain showing so that hangup commands can continue to be sent that will eventually disconnect the call correctly. Bug: 19933863 Change-Id: I2ff2018d7d229615f5f57c599f74954ec7492f6b