--- a/relnotes/next Wed Mar 10 05:50:20 2021 +0100
+++ b/relnotes/next Wed Mar 10 18:09:21 2021 +0100
@@ -26,6 +26,13 @@
== Backwards Compatibility Changes ==
+ * In normal repositories, the first parent of a changeset is not null,
+ unless both parents are null (like the first changeset). Some legacy
+ repositories violate this condition. The revlog code will now
+ silentely swap the parents if this condition is tested. This can
+ change the output of `hg log` when explicitly asking for first or
+ second parent.
+
== Internal API Changes ==