static int showForm_leftWidth_safetyMargin = 10;

static int showForm_leftWidth(LL<JComponent> l) {
  forEachLevel2(l, x -> vmBus_send updateLayoutNow(x));
  int minW = 0;
  for (L<JComponent> row : l)
    minW = max(minW, getMinimumSize(first(row)).width);
  ret minW + or((Int) vmBus_query formSafetyMargin(), showForm_leftWidth_safetyMargin);
}