Showing a second toast before the previous one disappears makes it disappear too soon

[atn832]

If I show a first toast for 5 seconds, then after 4 seconds show a second toast, then the second message gets shown only one second. Seems like there are two ways one could fix that:

• Using a Timer instead of Future.delayed. Timers can be canceled. https://api.dart.dev/stable/2.3.1/dart-async/Timer/cancel.html
• Wrapping the Future.delayed with a CancelableOperation. https://pub.dev/documentation/async/latest/async/CancelableOperation-class.html

[atn832]

FlutterToast/lib/toast.dart

Lines 121 to 122 in 372fe04

	await Future.delayed(Duration(seconds: duration ?? Toast.lengthShort));
	dismiss();