stop method
Stops the Stopwatch.
The elapsedTicks count stops increasing after this call. If the Stopwatch is currently not running, then calling this method has no effect.
Implementation
void stop() { _stop ??= _now(); }
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Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
https://api.dart.dev/stable/2.13.0/dart-core/Stopwatch/stop.html