blocking property

bool blocking

Whether this render object is blocking semantics of previously painted RenderObjects below a common semantics boundary from the semantic tree.

Implementation 

bool get blocking => _blocking;
void blocking= (bool value)

Implementation 

set blocking(bool value) {
  assert(value != null);
  if (value == _blocking)
    return;
  _blocking = value;
  markNeedsSemanticsUpdate();
}