Compares a layer state to the layers in the current drawing
Supported Platforms: Windows and Mac OS
(layerstate-compare layerstatename viewport)
Type: String
Name of the layer state compare.
Type: Ename (entity name)
An ename of the viewport to be used in the compare. If viewport is nil, the current viewport is used
Type: T or nil
T if successful; otherwise nil.
(layerstate-compare "myLayerState") nil