removeOverlay method
Remove overlay
Implementation
void removeOverlay(Key key) {
final toRemove = _overlays.singleWhere(
(o) => o.key == key,
orElse: () => OverlayData.invalid,
);
if (toRemove != OverlayData.invalid && toRemove.context != null) {
_overlays.remove(toRemove);
_updateOverlay(toRemove.context!);
}
}