setBackButtonInsets method
Customise the portrait (non-fullscreen) back-button inset.
Pass top and/or left in points. Either argument may be null to keep
the corresponding default (top=8, left=15). Pass both as null to reset.
Implementation
Future<void> setBackButtonInsets({double? top, double? left}) {
final args = <String, dynamic>{};
if (top != null) args['top'] = top;
if (left != null) args['left'] = left;
return _invoke('setBackButtonInsets', args);
}