With this change a warning is shown if the user does not explicitly specify the target revision, but the behavior is unchanged (it still defaults to the working copy).
In the future the warning will be turned into an error. In other words, it will be required to specify target revision.
The bulk of the changes here are to prepare tests for the upcoming change, to make the transition easier.
For additional details please see:
* https://github.com/jj-vcs/jj/issues/5374
* https://github.com/jj-vcs/jj/discussions/5363
This adds a new `revsets.simplify-parents` configuration option (similar
to `revsets.fix`) which serves as the default revset for `jj
simplify-parents` if no `--source` or `--revisions` arguments are
provided.
The previous iteration of `jj simplify-parents` would only reparent the
commits in the target set in the `MutableRepo::transform_descendants`
callback. The subsequent `MutableRepo::rebase_descendants` call invoked
when the transaction is committed would then rebase all descendants of
the target set, which includes the commits in the target set again.
This commit updates the `MutableRepo::transform_descendants` callback to
perform rebasing of all descendants within the callback. All descendants
of the target set will only be rebased at most once.
