Such methods may still have regressions and really error prone because of difficult to keep syncing container/offset and child node. We should use EditorDOMPoint which starts to sync these information automatically since bug 1408544. (And maybe this bug needs to change something of RangeBoundaryBase in this bug.)

EditorBase::FindBetterInsertionPoint(), EditorBase::InsertTextImpl(), WSRunObject::InsertText() (bug 1406482) EditorBase::GetPriorNode(), EditorBase::GetNextNode(), HTMLEditor::GetPriorHTMLNode(), HTMLEditor::GetNextHTMLNode() (bug 1407305) DeleteRangeTransaction::CreateTxnsToDeleteBetween() (bug 1407352) EditorBase::SplitNodeDeep(), HTMLEditor::InsertNodeAtPoint() (bug 1407447) CreateElementTransaction::CreateElementTransaction(), EditorBase::CreateTxnForCreateElement(), EditorBase::CreateNode() (bug 1407854) InsertNodeTransaction::InsertNodeTransaction(), EditorBase::CreateTxnForInsertNode(), EditorBase::InsertNode() (bug 1408125)

Now, all methods which touched by Ehsan to reduce nsINode::IndexOf() calls are now redesigned with Editor(Raw)DOMPoint. This could increase some other cost like creating temporary object, validation, etc, but ideally we will be get rid of nsINode::IndexOf() calls after refactoring editor with Editor(Raw)DOMPoint more.