widgets library Null safety

Classes

CastButton
CastIcon
ExpandedControls
ExpandedControlsConnectedDeviceLabel
ExpandedControlsPlayer
ExpandedControlsProgress
ExpandedControlsProgressController
ExpandedControlsToolbar
MiniController
QueueList

Constants

CAST_DEVICE_NAME_PLACEHOLDER → const String
Placeholder to be used for the castingToText of ExpandedControlsConnectedDeviceLabel
"{{cast_device_name}}"