BUG: snappyHexMesh: minThickness > 1 caused truncation of layers
The start of the layer addition loop does a synchronisation of the wanted displacement. This also does a truncation of the displacement if it is < minThickness. At the first iteration the displacement was initialised to vector::one which might trigger the truncation logic (and then disable extrusion altogether). Instead we now initialise the displacement to vector::GREAT before entering the synchronisation.
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