Improve schema fix

[YousefED]

See https://matrix.to/#/!zYdipGamjhpcnxfVmZ:matrix.org/$YrNxFswUGZl46xesWnbj4RHT2y2wgyYtrWLWunKTIn8?via=matrix.org

The schema fix can caus to lose / missinterpret attribution data. For ex: Indent of a child become deletion and insertion.

Can we come up with better solutions?