String ellipsis

The string used to ellipsize overflowing text. Setting this to a nonempty string will cause this string to be substituted for the remaining text if the text can not fit within the specificed maximum width.

Source 

String get ellipsis => _ellipsis;
void ellipsis=(String value)

Source 

set ellipsis(String value) {
  assert(value == null || value.isNotEmpty);
  if (_ellipsis == value)
    return;
  _ellipsis = value;
  _paragraph = null;
  _needsLayout = true;
}