Return false in click handler to prevent default behaviour.

This is useful when the input field is located in a dropdown or something similar
and prevents it to be closed.

src/jquery.autocomplete.js

@@ -169,6 +169,7 @@
             // Listen for click event on suggestions list:
             container.on('click.autocomplete', suggestionSelector, function () {
                 that.select($(this).data('index'));
+                return false;
             });
 
             that.fixPosition();