Function drop_squashed_by_tree_id

pub fn drop_squashed_by_tree_id(
    graph: &mut Graph,
    pulled_tree_ids: impl Iterator<Item = Oid>,
)

Quick pass for what is droppable

We get into this state when a branch is squashed. The id would be different due to metadata but the tree_id, associated with the repo, is the same if your branch is up-to-date.

The big risk is if a commit was reverted. To protect against this, we only look at the final state of the branch and then check if it looks like a revert.

To avoid walking too much of the tree, we are going to assume only the first branch in a stack could have been squash-merged.

This assumes that the Node was rebased onto all of the new potentially squash-merged Nodes and we extract the potential tree_id’s from those protected commits.