Slider label text not rendered when nested in a Row

[xqwzts]

When nesting a Slider widget in a Row the thumb shows up, but the text isn't rendered:

Widget _buildLineControls() {
    return new Column(
      children: <Widget>[
        new Row(
          children: <Widget>[
            const Text('Line width:'),
            new Expanded(
              child: new Slider(
                min: 1.0,
                max: 15.0,
                divisions: 15,
                label: '${lineWidth.round()}',
                value: lineWidth,
                activeColor: lineColor,
                onChanged: onLineWidthChanged,
              ),
            ),
          ],
        ),
      ],
    );
  }

But it works fine without the Row:

Widget _buildLineControls() {
    return new Column(
      children: <Widget>[
               new Slider(
                min: 1.0,
                max: 15.0,
                divisions: 15,
                label: '${lineWidth.round()}',
                value: lineWidth,
                activeColor: lineColor,
                onChanged: onLineWidthChanged,
              ),
      ],
    );
  }

This is on the latest master version:

Doctor summary (to see all details, run flutter doctor -v):
[✓] Flutter (Channel master, v0.2.3-pre.41, on Linux, locale en_US.UTF-8)
[✓] Android toolchain - develop for Android devices (Android SDK 27.0.3)
[✓] Android Studio (version 3.0)
[✓] IntelliJ IDEA Community Edition (version 2017.2)
[✓] VS Code (version 1.21.1)
[✓] Connected devices (1 available)

[jason-simmons]

Duplicate of #15702

[github-actions]

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