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0e99fa7a1e
When notifying a backend about a layer being modified we now pass the layers current owner for reference. NB: Although a layer can indirectly be referenced by multiple layers, a layer is considered immutable once it has dependants, so there is only ever one material associated with a layer being modified. Passing the material pointer to the backends layer_pre_change callback can be useful for backends that associate their private state with materials and may need to update that state in response to layer changes.