This operation is not supported by an unmodifiable list.
void setRange(int start, int end, Iterable<E> iterable, [int skipCount = 0]) { throw new UnsupportedError("Cannot modify an unmodifiable list"); }
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https://api.dart.dev/stable/2.5.0/dart-typed_data/UnmodifiableUint8ClampedListView/setRange.html