Also having hit this issue in a recent project, I created a special extension specifically for select2 version 4.0.2 that works with x-editable. I also added the possibility of having unique dropdown data for each row, if necessary.
Blog entries and downloads are available at www.fifthmorrison.com
I agreed to the excellence of this plugin, and if anyone has the time to accept it, it would definitely be appreciated here.
Hope this helps at the same time!
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