So there is no settled case that specifically addresses the question of whether the children of foreigners, provided they were born on US soil, qualify under the Constitution to hold the office of POTUS?
Correct. WKA did not specifically HOLD that WKA was a NBC. Therefor, it is not binding on lower courts to rule Obama is a NBC.
However, since the clear guidance in WKA is that WKA was a NBC, contrary to the argument made by the state against him, no court will reject that guidance and substitute its own theory. That is why every court has rejected the birther case.