private @NotNull @NlsContexts.Tooltip String getPopupTooltip() {
    StringBuilder sb = new StringBuilder();
    String prefix = "";
    for (KeyStroke stroke : getKeyStrokes()) {
      if (0 == stroke.getModifiers()) {
        sb.append(prefix).append(KeymapUtil.getKeystrokeText(stroke));
        prefix = ", ";
      }
    }
    return IdeBundle.message("tooltip.text.add.shortcut.with.special.keys", sb.toString());
  }
private @NotNull @NlsContexts.Tooltip String getPopupTooltip()