There are different situations which were taken into account. For simple 2D charts like line, area, bar, pie, bubble, selected element (like bar, arc, circle) will have another color, lighter or darker depending on the brightness of the current color. For 3D charts like dome, cylinder, parallelepiped, selected element will be the 'visible' part of it and it needs some more drawing adjustments to show (after fill) all the lines and arcs that are supposed to be on top.
Let's see some examples of highlighting.
Bar highlighting:
Stackedbar highlighting:
Line highlighting:
Pie highlighting:
Cylinder highlighting with different area selection between top and other elements:
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