Number of points dropped from the front by the maxWidth sliding window.
True when the point was merged into a nested group layer (e.g. multiline),
where row is the series index. For flat layers row/col are announce
coordinates whose meaning depends on the trace type (e.g. candlestick
rows are OHLC sections).
Which trace axis a sliding-window trim shifts: 'col' when columns index data points, 'none' when the point axis is not the column axis (e.g. horizontal candlesticks) and no cursor shift should be applied.
Location of a newly appended data point, expressed in trace coordinates (
row= group/series index,col= point index within the group).