flutter-advanced-book
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Exception in chapter1/widget_offset.md
class PopupState -> initState -> "button = widget.btnContext.findRenderObject();" click IconButton in ListViewItem Exception caught by widgets library => type 'RenderSliverList' is not a subtype of type 'RenderBox' [Flutter version 1.22.1]
同问, 也出现了这个问题