Summary:
The `-` graphnode can be confusing as `-` is also used for horizontal graph lines.
There are no good ASCII characters to use for invisible commits, so revert to
just using `x` so that they match obsolete commits.
Reviewed By: quark-zju
Differential Revision: D15293717
fbshipit-source-id: 5d1f327ddd8c3f104a99f494309a79b10ad71401
Summary:
Ordinarily loops are prevented in the mutation graph as the predecessors must exist
at the point that the successor is created. However, backfilling from a complex
obsolescence graph may inadvertently introduce cycles.
Since loops are invalid, we can safely ignore any mutation edges that may
introduce them. The `allpredecessors` and `allsuccessors` functions already
do this.
Add loop detection and ignoring to the `predecessorsset` and `successorssets`
functions.
Reviewed By: mitrandir77
Differential Revision: D15062399
fbshipit-source-id: fe892d9236c8d8dc4e1322b82618ab4bca35d30a
