power-select mouse bug

controllers.application.js

import Ember from 'ember';

export default Ember.Controller.extend({
  catalog: [
    'Reese\'s pieces',
    'Blow Pops',
    'Almond Joy',
    'M&Ms',
    'Snickers',
    'Mr. Goodbar'
  ],
  
  selected: [
    'Reese\'s pieces',
    'Blow Pops'
  ],
  
  events: [],
  
  actions: {
    registerChange(values = []) {
      this.get('events').pushObject(`Power Select changed [${values.join()}]`);
      this.set('selected', values);
    }
  }
});

templates.application.hbs

<div id="container">
<ul style="float: right;">
  {{#each events as |event|}}
    <li>{{event}}</li>
  {{/each}}
</ul>

<div style="width: 200px;">
  {{#power-select-multiple
      closeOnSelect=false
      options=catalog
      selected=selected
      onchange=(action "registerChange")
      as |option|}}
    {{option}}
  {{/power-select-multiple}}
</div>

<ul>
  {{#each selected as |candy|}}
    <li>{{candy}}</li>
  {{else}}
    <li>No candy selected</li>
  {{/each}}
</ul>
</div>

twiddle.json

{
  "version": "0.12.1",
  "EmberENV": {
    "FEATURES": {}
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/1.11.3/jquery.js",
    "ember": "2.12.0",
    "ember-template-compiler": "2.12.0",
    "ember-testing": "2.12.0"
  },
  "addons": {
    "ember-data": "2.12.1",
    "ember-power-select": "1.8.4"
  }
}