IgnorePointer constructor
Creates a widget that is invisible to hit testing.
The ignoring argument must not be null. If ignoringSemantics, this
render object will be ignored for semantics if ignoring is true.
Implementation
const IgnorePointer({
Key key,
this.ignoring = true,
this.ignoringSemantics,
Widget child
}) : assert(ignoring != null),
super(key: key, child: child);