Hide Sorting Indicator Arrows when not hovering over them

MarkSnodgrass

It's great that you can sort charts different ways on the fly without having to go into Analyzer. However, once you click on the sorting arrows, they stay there and it can often get in the way of the visualization. It would be helpful if the sorting indicator arrows only showed up when you hovered over that area to change the sorting, and not permanently once you clicked on it.