Enhanced preview for architectural elements

When you drew multilayer architectural elements in earlier versions, the preview attached to the crosshairs displayed all layers at the height of the first layer, regardless of the actual height settings of these layers. The height settings were not displayed correctly until you entered the last point.

Now the preview of the component attached to the crosshairs is correct even if the height settings of the individual layers are based on different planes.

For performance reasons, the preview does not yet support layers associated with reference surfaces.