CharSequence getDeltaText()
CharSequence getOldText()
TextEditingDelta( @NonNull CharSequence oldText, int selectionStart, int selectionEnd, int composingStart, int composingEnd)
TextEditingDelta( @NonNull CharSequence oldEditable, int replacementDestinationStart, int replacementDestinationEnd, @NonNull CharSequence replacementSource, int selectionStart, int selectionEnd, int composingStart, int composingEnd)