UIP-3018 ResizeSensor intermittent null error in _reset

[greglittlefield-wf]

• Issue Type: BUG

We're seeing stacktraces sometimes originating from ResizeSensor:

resize_sensor.dart ResizeSensorComponent._reset 
resize_sensor.dart ResizeSensorComponent.componentDidMount.<anonymous function> 
resize_sensor.dart _SafeAnimationFrameMixin.requestAnimationFrame.<anonymous function> 

message: Uncaught exception: NullError: x is null

One potential cause of this is that _reset is being called after the component is unmounted, with the unmount taking place during the animation frame delay.

We should add a _isMounted check inside _reset to hopefully fix this.

[rmconsole-wf]

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