private AnAction createToggleAction() {
      // This gutter's actions are not collected to any menu, so we use SimpleAction.
      return DumbAwareAction.create(e -> {
        // Semantics:
        // - disable all if any is enabled,
        // - enable all if all are disabled.
        var newEnabledValue = areAllDisabled();
        for (var b : breakpoints) {
          b.setEnabled(newEnabledValue);
        }
      });
    }
private AnAction createToggleAction()