Called when a layer has been marked as visible or invisible. When a layer has been marked as invisible, expect a LayerHideEvent very soon.
But, when a layer has been marked as visible, that does not necessarily mean it will become visible. There are more requirements that have to be met in order for a layer to become visible: the map's scale must be between the minimum and maximum allowed scales for the layer. If that requirement has been met as well, expect a LayerShowEvent shortly.
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