private boolean contains(Address blockAddr, BigInteger offset) {
		for (int i = 0; i < changeList.size(); i++) {
			ByteEditInfo edit = changeList.get(i);
			if (edit.getBlockAddress().compareTo(blockAddr) == 0 &&
				edit.getOffset().equals(offset)) {
				return true;
			}
		}
		return false;
	}
Return true if the block and offset are in the list.

@param list either the local change list or the external change list
@param block block in question
@param offset offset into the block
Ghidra/Features/ByteViewer/src/main/java/ghidra/app/plugin/core/byteviewer/ByteBlockChangeManager.java