TrackingVolume::layerCandidatesOrdered selects NavigationLayers (was ACTS-441)

Original author Fabian Klimpel @fklimpel

If the first layer in a TrackingVolume is a NavigationLayer then it will be set as sLayer in TrackingVolume::layerCandidatesOrdered(). This function always returns sLayer as an element of the vector. Therefore this configuration treats the NavigationLayer as an interaction with a surface.

Edited Mar 27, 2019 by Moritz Kiehn

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