Autocomplete menu bindings not cleared

When updating from 1.11.2 to 1.12.1 we noticed our autocomplete getting slower and slower the more we used it without refreshing the page.

I've traced this to the _suggest function in autocomplete where the DOM is emptied but the bindings are not resulting in thousands of references to DOM elements that do not exist.

_suggest: function( items ) {
   var ul = this.menu.element.empty();
   this._renderMenu( ul, items );

I added a line to reset the bindings:

_suggest: function( items ) {
   var ul = this.menu.element.empty();
   this.menu.bindings = $();
   this._renderMenu( ul, items );

I think a more complete solution would be to add a function in the Menu widget to clear both the DOM and bindings.