public void addStartBytecodeMapping(BitSet bytecodeOffsets) {
    if (bytecodeOffsets == null) {
      return;
    }
    for (int i = bytecodeOffsets.nextSetBit(0); i >= 0; i = bytecodeOffsets.nextSetBit(i + 1)) {
      addStartBytecodeMapping(i);
    }
  }
If the current group is applied, add a newline here. Otherwise, add the argument.
If {@code dedent} is true, the extra indent from this group is unapplied from this point on.
src/org/jetbrains/java/decompiler/util/TextBuffer.java