Currently, they do nothing because they specify empty range to `SpellCheckBetweenNodes()`, and it makes the method does nothing. This is filed as bug 1581714. However, they are not required because `HTMLEditor` notifies `mozInlineSpellChecker` at ending handling the top level edit sub action. https://searchfox.org/mozilla-central/rev/a12c2c2e59c92d8f969d8f3f290ab16919449c9d/editor/libeditor/HTMLEditSubActionHandler.cpp#675 Therefore, these methods are not necessary anymore. Differential Revision: https://phabricator.services.mozilla.com/D130457