debugDescribeFocusTree function Null safety
Returns a text representation of the current focus tree, along with the current attributes on each node.
Will return an empty string in release builds.
Implementation
String debugDescribeFocusTree() {
assert(WidgetsBinding.instance != null);
String? result;
assert(() {
result = FocusManager.instance.toStringDeep();
return true;
}());
return result ?? '';
}