sign-all = true does not sign commits created by jj split (but yes those created by jj new)

[jalil-salame]

Description

I started using a Nitrokey 3A Mini device (required by work) to sign my commits. jj split does not sign the commits created.

Steps to Reproduce the Problem

1. Setup a signing key.
2. Do some changes.
3. Run jj split and create two commits
4. Observe the commits with git log --show-signature
5. See that the commits created by jj split do not contain a signature.

Expected Behavior

Commits created by jj split should contain a signature

Actual Behavior

Commits created by jj split don't contain a signature

Specifications

• Platform: linux
• Version: jj 0.24.0

[jalil-salame]

This might be related to #4561 as I noticed the commits were not using my work email, but my personal email.

[martinvonz]

Yes, it's probably that. Feel free to reopen if it happens with commits authored by you.