Visits the immediate children of this node.
This function calls visitor for each child in a pre-order travseral until visitor returns false. Returns true if all the visitor calls returned true, otherwise returns false.
Source
void visitChildren(SemanticsNodeVisitor visitor) {
if (_children != null) {
for (SemanticsNode child in _children) {
if (!visitor(child))
return;
}
}
}