if the user just has some modifications on the color related settings in the option panel, the the heatmap color label legend should re-render based on the changes, but actually not.
I think maybe there's no color related options for all the others vislib type visualizations and the only exception is the Heatmap, so someone forget to do something to render this color label legend
e.g.1 color schema change from Greens to Reds
e.g.2 Checked Percentage Mode