@Override
	public boolean isChanged(ByteBlock block, BigInteger index, int length) {
		return bbcm.isChanged(block, index, length);
	}
Return true if the block has been changed at the given index.

@param block byte block
@param index offset into the block
@param length number of bytes in question
Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/ProgramByteBlockSet.java