RenderIgnorePointer constructor Null safety
Creates a render object that is invisible to hit testing.
The ignoring argument must not be null. If ignoringSemantics is null,
this render object will be ignored for semantics if ignoring is true.
Implementation
RenderIgnorePointer({
  RenderBox? child,
  bool ignoring = true,
  bool? ignoringSemantics,
}) : _ignoring = ignoring,
     _ignoringSemantics = ignoringSemantics,
     super(child) {
  assert(_ignoring != null);
}