Rendering: changing the plottable list mid-render will cause an exception #3753
Description
Issue: (It will cause collection has changed exception on Rendering)
ScottPlot Version: (5.0.31)
/* code to reproduce the bug */
MeasuredSpan = avaplot.Plot.Add.HorizontalSpan(x1, x1, Colors.Red.WithOpacity(0.4));
MeasuredSpan.Axes.XAxis = avaplot.Plot.Axes.Top;when Plot.Add.HorizontalSpan() called,it will add to the PlottableList,if now is rendering,it will caused collection has changed exception.
So rp.Plot.PlottableList need a sample clone, for example rp.Plot.PlottableList.ToList()