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Volker Krause authored
We only use that to allow changing the layer tag from CSS rules so far. This allows fixing buildings placed on two high layers above their interior for a number of major railway stations for example. This is caused by the layer tag being (ab)used as a z-inded for the outdoor renderer there, but not being consistently applied to all elements. In those cases we cap the layer to 0 now. More such rules are likely needed though, there are more scenarios where layer tags interfere. But that's much easier to extend now that this can be specified as a simple CSS rule.
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