message: demo: Add unit tests for simplify with borders
  The locked corner test failed before the border changes and now it
  passes.
diff: @@ -689,6 +689,18 @@ static void simplifyStuck()
  assert(meshopt_simplify(ib2, ib2, 9, vb2, 5, 12, 6, 1e-3f) == 6);
  assert(meshopt_simplify(ib3, ib3, 9, vb2, 5, 12, 6, 1e-3f) == 9);
  +
  + // 4-vertex quad with a locked corner can't be simplified due to border error-induced restriction
  + float vb4[] = {0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0};
  + unsigned int ib4[] = {0, 1, 3, 0, 3, 2};
  +
  + assert(meshopt_simplify(ib4, ib4, 6, vb4, 4, 12, 3, 1e-3f) == 6);
  +
  + // 4-vertex quad with a locked corner can't be simplified due to border error-induced restriction
  + float vb5[] = {0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 1, 0, 1, 1, 0};
  + unsigned int ib5[] = {0, 1, 4, 0, 3, 2};
  +
  + assert(meshopt_simplify(ib5, ib5, 6, vb5, 5, 12, 3, 1e-3f) == 6);
  }
  static void simplifySloppyStuck()
  