static JSplitPane jhsplit_v2(Component l, Component r) {
  ret jhsplit_v2(l, r, 0.5);
}

static JSplitPane jhsplit_v2(Component l, Component r, double splitPoint) {
  ret setSplitPaneOnFirstShowing(
    swingNu(JSplitPane.class, JSplitPane.HORIZONTAL_SPLIT, wrap(l), wrap(r)),
    splitPoint);
}