/// Count the number of words in the text between these two iterators
int countWords(DocIterator const & from, DocIterator const & to);
+/// Count the number of chars in the text between these two iterators
+int countChars(DocIterator const & from, DocIterator const & to, bool with_blanks);
+
/// updates all counters
void updateLabels(Buffer const &, bool childonly = false);