mBaseHeight sets the height of the candle area only. The volume pane (60 px)
and each indicator pane (100 px by default, or its resized height) are stacked
below it.
- Unset (recommended): the candle area is derived from the widget's
constraints so the whole stack fits. Place the chart in an
Expandedto fill the available space. - Set: the candle area has a fixed height. Use this when there is no bounded height to divide, such as inside a scroll view.
