Scrollspy doesn't like hidden navigation element

Created by: AnonymousMeerkat

This is my code:

    <div class="navbar-header hidden-md hidden-lg">
        <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbarthingy">
            <span class="sr-only">Toggle navigation</span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
            <span class="icon-bar"></span>
        </button>
        <a class="navbar-brand active" href="#home">
            XYZ
        </a>
    </div>
    <div id="navbarthingy" class="collapse navbar-collapse">
        <ul class="nav navbar-nav">
            <li class="hidden-xs hidden-sm"><a class="navbar-brand" href="#home">XYZ</a></li>
            <li class="hidden-md hidden-lg"><a href="#home">Home</a></li>
            <li><a href="#about">About</a></li>
            <li><a href="#faq">F.A.Q.</a></li>
            <li><a href="#contact">Contact</a></li>
            <li><a href="#blog">Blog</a></li>
        </ul>
    </div>

It looks fine with mobile and desktop, until I add scrollspy. One that happens, when i scroll down to about, it flickers between XYZ and About constantly (in the desktop page).

The fix for this is trivial:

    ScrollSpy.prototype.refresh = function () {
      var offsetMethod = this.$element[0] == window ? 'offset' : 'position'

      this.offsets = $([])
      this.targets = $([])

      var self     = this
      var $targets = this.$body
        .find(this.selector)
        .map(function () {
          var $el   = $(this)
          var href  = $el.data('target') || $el.attr('href')
          var $href = /^#./.test(href) && $(href)

          return ($href
            && $el.is(':visible') // <==  This is the magic line to include
            && $href.length
            && $href.is(':visible')
            && [[ $href[offsetMethod]().top + (!$.isWindow(self.$scrollElement.get(0)) && self.$scrollElement.scrollTop()), href ]]) || null
        })
        .sort(function (a, b) { return a[0] - b[0] })
        .each(function () {
          self.offsets.push(this[0])
          self.targets.push(this[1])
        })
    }

After that fix, everything works fine =)