Why do we wrap trailingButton with ExcludeSemantics when leadingIcon is null?

I think a better solution for this would be:

• Implement visitChildrenForSemantics in _DropdownMenuBody.
• All children in DropdownMenuBody are used for a measurement purpose, except the first child textField. So in the method, we can just visit the first child for its semantics and then skip the rest of them.

The method can look like this:

  @override
  void visitChildrenForSemantics(RenderObjectVisitor visitor) {
    visitChildren((RenderObject renderObjectChild) {
      final RenderBox child = renderObjectChild as RenderBox;
      if (child == firstChild) {
        visitor(renderObjectChild);
      }
      return;
    });
  }

• Please also add a comment above this method to explain why we skip all the children except the first one. Something like: // Children except the text field (first child) are laid out for measurement purpose but not painted.

@QuncCccccc Hey, thanks for the suggestion. Have made changes accordingly, do check and let me know if I missed something. Thank you.