@Override
  public String toString() {
    if (!ALLOW_TO_STRING) {
      if (DecompilerContext.getOption(IFernflowerPreferences.UNIT_TEST_MODE)) {
        throw new AssertionError("Usage of TextBuffer.toString");
      } else {
        DecompilerContext.getLogger().writeMessage("Usage of TextBuffer.toString", IFernflowerLogger.Severity.WARN);
      }
    }
    return convertToStringAndAllowDataDiscard();
  }
Recursive reformatting of groups.
If the group's content would take you over the specified preferred line length, then the group is applied.

- This algorithm usually ensures that if a group is applied, then all the group's parents in the tree are also
  applied. This tends to produce a nice structured output with well-placed potential newlines.
- The formatter keeps track of the offset as a result of the reformat at each character in the text buffer, and
  applies them to the bytecode offsets afterwards, so that the line number mappings don't get messed up.
src/org/jetbrains/java/decompiler/util/TextBuffer.java