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Sets whether changes to the active layer should be temporarily blocked. Exposes a previously private optimisation for use by plugins. This is a low-level method, designed to avoid unnecessary work when adding lots of layers at once. Clients which will be adding many layers may call blockActiveLayerChanges( TRUE ) upfront, add all the layers, and then follow up with a call to blockActiveLayerChanges( FALSE ). This will defer emitting the active layer changed signal until they've added all layers, and only emit the signal once for the final layer added.