A federal three-judge panel in San Antonio ruled Thursday that the state’s long-delayed primary election would be held on May 29, with a runoff on July 31. The judges had twice pushed back the primary because of a redistricting dispute. Black and Hispanic groups sued the state over the electoral maps drawn by the Republican-controlled Legislature, saying the maps discriminated against minorities. With the new May 29 date, Texas will hold one of the last primaries in the country, weakening its ability to influence the Republican presidential race.