static F1<Container, Dimension> formLayouter2(O... _) {
  int yplus = optPar yPlus(_, 5); // make higher (bug fixing)
  int fixer2 = optPar fixer2(_, 0);
  int rightMargin = optPar rightMargin(_, 10);
  ret func(Container parent) -> Dimension {
    L<Component> l = getComponents(parent);
    new BitSet bigOnes;
    for i over l:
      if (containsATextArea(l.get(i))) add(bigOnes, i);
      
    int nBigOnes = bigOnes.cardinality();
    int mandatoryHeight = totalPreferredHeight(listWithoutIndicesInBitSet(l, bigOnes));
    int gap = 4, outerSpacing = 5;
    Dimension size = parent.getSize();
    int gapsAndMargins = outerSpacing*2-(l(l)-1)*gap;
    int totalSpace = size.height-gapsAndMargins-fixer2;
    int liberalSpace = totalSpace-mandatoryHeight;
    int width = size.width-outerSpacing*2-rightMargin;
    double perBigOne = doubleRatio(liberalSpace, nBigOnes);
    double y = outerSpacing;
    for i over l: {
      Component c = l.get(i);
      bool big = contains(bigOnes, i);
      double h = big ? perBigOne : c.getPreferredSize().height;
      int actualY = iround(y);
      c.setBounds(10, actualY, width, iround(y+h)-actualY);
      y += h+gap;
    }
    
    // return preferred size
    Dimension pref = componentsBoundingSize(parent, outerSpacing);
    if (parent.getHeight() == 0) // pre-showing - maybe we should always do this
      pref.height = totalPreferredHeight(l)+gapsAndMargins+yplus;
    ret pref;
  };
}

Began life as a copy of #1014730