Obtains an iterator pointing to char_offset within the given line.
Note characters, not bytes; UTF-8 may encode one character as multiple
bytes.
If line_number is greater than or equal to the number of lines in the buffer,
the end iterator is returned. And if char_offset is off the
end of the line, the iterator at the end of the line is returned.
Obtains an iterator pointing to char_offset within the given line.
Note characters, not bytes; UTF-8 may encode one character as multiple bytes.
If line_number is greater than or equal to the number of lines in the buffer, the end iterator is returned. And if char_offset is off the end of the line, the iterator at the end of the line is returned.