Loosing focus on the field if addItems method is used

[jf-cbd]

I did:

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• Create a minimal working example on JsFiddle or Codepen
  (or gave a link to a demo on the Selectize docs)
• Indicate precise steps to reproduce in numbers and the result,
  like below

Steps to reproduce:

1. In the following CodePen, when a key is released on an input field, it performs addItem on the selectize.
2. Try typing a key in the input. The option is added, focus is still on the input field.
3. Replace the selectize.addItem(optionValue, true); by selectize.addItems([optionValue], true)
4. Try typing a key in the input. The option is added, but focus is lost on the input field.

Example : https://codepen.io/grandroot/pen/dyEYVVW

Expected result: Still have the focus on the input

Actual result: Loosing focus

Workaround : Replace
me.addItems(aSelectedItems, true);
By
aSelectedItems.forEach(function(item) { me.addItem(item, true); });

Additional info : Problem happened after migrating from Selectize 0.12.4 to 0.15.2

[github-actions]

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