记录：因大小写而Provider无法找到

github.com/microsoft/T…

Suggestion: case-sensitive imports

我的文件是'layout/flex_list.dart';
我的import 是'layout/Flex_List.dart';
这时inheritWidget里的获取方法会有如下结果：
xxx is targetType = true
_inheritedWidgets[targetType] = null;
_inheritedWidgets[xxx] != null

@override
  InheritedWidget inheritFromWidgetOfExactType(Type targetType, { Object aspect }) {
    assert(_debugCheckStateIsActiveForAncestorLookup());
    final InheritedElement ancestor = _inheritedWidgets == null ? null : _inheritedWidgets[targetType];
    if (ancestor != null) {
      assert(ancestor is InheritedElement);
      return inheritFromElement(ancestor, aspect: aspect);
    }
    _hadUnsatisfiedDependencies = true;
    return null;
  }