Please add the ability to include the hatching/stroke_style used for a particular data series in the legend

[archangel16179]

For colorblind users, having the legend include more than just the color is helpful to them. Currently, they can see the colors, but charts may not be as useful if they cannot distinguish between them well.

The only workaround is to turn off individual series to isolate the one they need, but that doesn't help if they need to compare two series.