Get the height of the box.
In some usages, the height of a box may be dynamically determined. An example is the width of an
LegendBox, which cannot be known until all data are available. In these cases, the width is undefined until the chart has been laid out (using
BaseChart.layout) or the chart image has been drawn (eg. using
BaseChart.makeChart,
BaseChart.makeChart2 or
BaseChart.makeSession).
The height of the box in pixels.
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