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@ -5,7 +5,7 @@ import 'package:pinball_flame/pinball_flame.dart';
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/// Appends a new [ContactCallbacks] to the parent.
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/// Appends a new [ContactCallbacks] to the parent.
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///
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///
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/// This is a convenience class for adding a [ContactCallbacks] to the parent.
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/// This is a convenience class for adding a [ContactCallbacks] to the parent.
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/// In constrast with just assigning a [ContactCallbacks] to a userData, this
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/// In contrast with just assigning a [ContactCallbacks] to a userData, this
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/// class respects the previous userData.
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/// class respects the previous userData.
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///
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///
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/// It does so by grouping the userData in a [_UserData], and resetting the
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/// It does so by grouping the userData in a [_UserData], and resetting the
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