[web:a11y] LabelAndValue role overrides Checkable role

[yjbanov]

When the framework merges Checkbox semantics with Text semantics into a single node, the LabelAndValue role manager can take precedence and end up assigning role="text" to the HTML DOM element, which confuses screen readers.

Sample widget structure that leads to this situation:

  Widget build(BuildContext context) {
    return ListView(
      children: <Widget>[
        Row(
          children: [
            Checkbox(
              autofocus: true,
              value: _value,
              onChanged: (value) {
                setState(() {
                  _value = value!;
                });
              },
            ),
            const Text('this is a label'),
          ],
        ),
      ],
    );
  }

[github-actions]

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