Lays an SVG of the chart's marks over a canvas-rendered chart.
Does nothing to a chart ECharts drew as SVG: its marks are already in the
document, and a second set would be counted twice. Replaces the overlay a
previous pass drew, because the chart may have been resized or given new
data since -- unless the new one is identical, so that the elements a
mounted MAIDR instance already resolved stay in the document.
Lays an SVG of the chart's marks over a canvas-rendered chart.
Does nothing to a chart ECharts drew as SVG: its marks are already in the document, and a second set would be counted twice. Replaces the overlay a previous pass drew, because the chart may have been resized or given new data since -- unless the new one is identical, so that the elements a mounted MAIDR instance already resolved stay in the document.