Description

Running jj undo that restores to the root operation puts the repo in a state where there is no working copy
In this state, many jj commands do not work, like jj new
The error message is

Error: This command requires a working copy

jj redo does work, but there is no hint in the error message that it will

Steps to Reproduce the Problem

jj git init --no-colocate
jj undo
jj commit -m "A"

Expected Behavior

A better error message, with a hint that jj redo can be used to put the repo back to a working state
Or, better yet, prevent undo that restores to root operation

Actual Behavior

Error: This command requires a working copy

Specifications

• Platform: macOS Sequoia 15.6.1
• Version: 0.35.0