Handle concurrent editing of Tree.Edit #1936

Annotations

10 errors

Error return value of `n.IndexTreeNode.SetChildren` is not checked (errcheck)

Error return value of `split.IndexTreeNode.SetChildren` is not checked (errcheck)

Error return value of `fromParent.InsertAt` is not checked (errcheck)

Error return value of `fromParent.InsertAfter` is not checked (errcheck)

exported: comment on exported method Node.ChildIndex should be of the form "ChildIndex ..." (revive)

exported: comment on exported method Node.FindOffset should be of the form "FindOffset ..." (revive)

exported: exported method Tree.PathToIndex should have comment or be unexported (revive)

increment-decrement: should replace refined += 1 with refined++ (revive)

exported: comment on exported var DummyTreeNodeId should be of the form "DummyTreeNodeId ..." (revive)

exported: comment on exported method TreePos.Equals should be of the form "Equals ..." (revive)