docs: public void append(String msg) {
          verifySystemOut();
          PrintStream printStream = out;
          try {
              if (userInputActive && !appendCalled) {
                  printStream.print(moveDownToSkipPrompt());
                  appendCalled = true;
              }
              if (msg.endsWith(LINE_SEPARATOR)) {
                  printStream.print(msg);
              } else {
                  printStream.println(msg);
              }
              cursorMove = 0;
          } finally {
              progressIndicatorActive = false;
          }
      }