I have two Vidmar in my tree.
Elizabeta VIDMAR born in Retece on Oct. 25, 1822. She married Jozef BRENCE in Retece, Feb.9, 1857 They had a child, Joze BRENCE born in Retece 19, Feb. 25,1858.
Mina VIDMAR born 1780. She married Urban JUGOVIC. They had a child, Gertrudis JUGOVIC in Grenc on March 7, 1826
Don't know who their parents or siblings were and not sure if there is a connection. Sorry.