message: [Gardening] Remove dead code from IOHandler (NFC)
  These functions are not referenced.
diff: @@ -957,8 +957,6 @@ public:
  void SetBackground(int color_pair_idx) {
  ::wbkgd(m_window, COLOR_PAIR(color_pair_idx));
  }
  - void UnderlineOn() { AttributeOn(A_UNDERLINE); }
  - void UnderlineOff() { AttributeOff(A_UNDERLINE); }
  void PutCStringTruncated(const char *s, int right_pad) {
  int bytes_left = GetWidth() - GetCursorX();
  @@ -1210,19 +1208,6 @@ public:
  return eKeyNotHandled;
  }
  - bool SetActiveWindow(Window *window) {
  - const size_t num_subwindows = m_subwindows.size();
  - for (size_t i = 0; i < num_subwindows; ++i) {
  - if (m_subwindows[i].get() == window) {
  - m_prev_active_window_idx = m_curr_active_window_idx;
  - ::top_panel(window->m_panel);
  - m_curr_active_window_idx = i;
  - return true;
  - }
  - }
  - return false;
  - }
  -
  WindowSP GetActiveWindow() {
  if (!m_subwindows.empty()) {
  if (m_curr_active_window_idx >= m_subwindows.size()) {
  @@ -1407,8 +1392,6 @@ public:
  int GetKeyValue() const { return m_key_value; }
  - void SetKeyValue(int key_value) { m_key_value = key_value; }
  -
  std::string &GetName() { return m_name; }
  std::string &GetKeyName() { return m_key_name; }
  