Steps to reproduce:

• start on a multi-commit stack (6eb in this example)
• sl prev
• make some changes and sl absorb
• notice that the current commit (1b81 in this example) is rewritten but the child (6eb in this example) is not

running sl restack after sl absorb is fine, but I feel like absorb should just do it.

Can anyone think of a downside to restacking after an absorb?