public void end_irreversible_action ()
Denotes the end of an action that may not be undone.
This will cause any previous operations in the undo/redo queue to be cleared.
This should be called after completing modifications to the text buffer after [method@Gtk.TextBuffer.begin_irreversible_action] was called.
You may nest calls to begin_irreversible_action and end_irreversible_action pairs.