code: function updateDropdownMenuHeight() {
              if (positionTarget) {
                  registerDropdownToggle(angular.element(positionTarget));
              }
  
              if (!angular.element(dropdownToggle).is(':visible')) {
                  return;
              }
  
              var availableHeight = getAvailableHeight();
              var scrollPosition = dropdownMenu.scrollTop();
  
              dropdownMenu.css({
                  height: 'auto',
              });
              dropdownMenu.css(availableHeight.direction, 'auto');
  
              var dropdownMenuHeight = dropdownMenu.find('.dropdown-menu__content').outerHeight();
  
              if ((availableHeight[availableHeight.direction] - ~~lxDropdown.offset) <= dropdownMenuHeight) {
                  if (availableHeight.direction === 'top') {
                      dropdownMenu.css({
                          top: 0,
                      });
                  } else if (availableHeight.direction === 'bottom') {
                      dropdownMenu.css({
                          bottom: 0,
                      });
                  }
              } else {
                  if (availableHeight.direction === 'top') {
                      dropdownMenu.css({
                          top: 'auto',
                      });
                  } else if (availableHeight.direction === 'bottom') {
                      dropdownMenu.css({
                          bottom: 'auto',
                      });
                  }
              }
  
              dropdownMenu.scrollTop(scrollPosition);
          }
docs: Update the height of the dropdown.
  If the content is too large to fit in the remaining size of the screen (to the top or the bottom), then make
  it scrollable.
  This function is called everytime the content inside of the dropdown changes.