// leaves lines enclosed in brackets alone
sS autoUnindent_honoringBrackets(S s) {
  LS l = lines_honoringBrackets(s);
  if (empty(l)) ret s;
  
  // find indent
  int n = Integer.MAX_VALUE;
  for (S l : toLines(s))
    n = min(n, getIndentOfLine(l));
  if (n == 0) ret s;
  
  // unindent
  for (int i = 0; i < l(l); i++)
    l.set(i, substring(l.get(i), n));
  ret fromLines(l);
}