opaque property
Whether this entry occludes the entire overlay.
If an entry claims to be opaque, then, for efficiency, the overlay will skip building entries below that entry unless they have maintainState set.
Implementation
bool get opaque => _opaque;
Implementation
set opaque(bool value) {
if (_opaque == value)
return;
_opaque = value;
assert(_overlay != null);
_overlay._didChangeEntryOpacity();
}