宏引用与宏定义同一文件中的符号。:Macro references to symbols in same file as macro definition d

Macro references to symbols in same file as macro definition don't get discovered.

某人（在这里开始的不一致对话开始）遇到了达多克的错误：

dartdoc:stdout: Generating docs for library services from package:flutter/services.dart...
dartdoc:stderr:   error: unresolved doc reference [onSelectionChanged]
dartdoc:stderr:     from services.TextSelectionDelegate.cutSelection: (file:///b/s/w/ir/x/w/flutter%20sdk/packages/flutter/lib/src/services/text_input.dart:874:8)
dartdoc:stderr:   error: unresolved doc reference [onSelectionChanged]
dartdoc:stderr:     from services.TextSelectionDelegate.pasteText: (file:///b/s/w/ir/x/w/flutter%20sdk/packages/flutter/lib/src/services/text_input.dart:904:16)
dartdoc:stderr:   error: unresolved doc reference [onSelectionChanged]
dartdoc:stderr:     from services.TextSelectionDelegate.selectAll: (file:///b/s/w/ir/x/w/flutter%20sdk/packages/flutter/lib/src/services/text_input.dart:934:8)
dartdoc:stderr:   error: unresolved doc reference [onSelectionChanged]
dartdoc:stderr:     from services.TextSelectionDelegate.copySelection: (file:///b/s/w/ir/x/w/flutter%20sdk/packages/flutter/lib/src/services/text_input.dart:956:8)

（从此构建日志中，此叉中的此PR）

The error is on a line like the line below, that references a macro in a library that would be a layer violation if it referenced it in code, since the flutter.rendering.RenderEditable.cause macro is defined in editable.dart in the widgets library, and it is what contains the reference to the missing onSelectionChanged symbol, which is also in the widgets library (in the same file as the macro). Dartdoc is expanding the macro, but then not finding the symbol. I imagine that Dartdoc knows nothing about Flutter's library layers, but I would have thought it could find the symbol.

  /// Cut current selection to [Clipboard].
  ///
  /// If and only if [cause] is [SelectionChangedCause.toolbar], the toolbar
  /// will be hidden and the current selection will be scrolled into view.
  ///
  /// {@macro flutter.rendering.RenderEditable.cause}
  void cutSelection(SelectionChangedCause cause) {

cc @jcollins-g