Ledwinka and Porsche often worked shoulder to shoulder on projects before the war. There was no lawsuit from Tatra
before/during the war,the lawsuit came form Joseph Ganz,who then where chased by Gestapo for blackmail,so he fled.
Remember Ganz was jewish. The history around this is far more complex then Porsche stole the design and that`s it.
Btw Volkswagen,the name was from 1923.