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Fixed analysis error. (#10035)
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@ -112,7 +112,7 @@ class _ExpansionTileState extends State<ExpansionTile> with SingleTickerProvider
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if (_isExpanded)
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_controller.forward();
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else
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_controller.reverse().then((Null value) {
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_controller.reverse().then<Null>((Null value) {
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setState(() {
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// Rebuild without widget.children.
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});
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