sS hCheckBoxMultiSelect_v2(O... _) {
  optPar bool verbose;
  
  ret hscript(replaceDollarVars([[
    var lastChecked;

    $(document).ready(function() {
      console.log("document ready");
      $("input[type=checkbox]").click(function(e) {
        var verbose = $verbose;
        var cls = this.className;
        if (verbose) console.log("cls=" + cls);
        if (!cls) return;
        
        if (!lastChecked || lastChecked.className != cls) {
          lastChecked = this;
          return;
        }
        
        var $chkboxes = $('input[type=checkbox].' + cls);
  
        if (e.shiftKey) {
          var start = $chkboxes.index(this);
          var end = $chkboxes.index(lastChecked);

          // change checkboxes, trigger their change event in case there are handlers installed
          $chkboxes.slice(Math.min(start, end), Math.max(start,end)+1).prop('checked', lastChecked.checked)
            .each(function(idx, chkbox) {
              chkbox.dispatchEvent(new Event('change'));
            });
        }
  
        lastChecked = this;
      });
    });
  ]], +verbose));
}

Began life as a copy of #1008423