getSelectedText method
Returns the currently selected text.
Implementation
String getSelectedText() {
if (_selectionStart == null || _selectionEnd == null) return '';
final start = math.min(_selectionStart!, _selectionEnd!);
final end = math.max(_selectionStart!, _selectionEnd!);
if (start == end) return '';
return _value.sublist(start, end).join();
}