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Is there a way to refresh a select2 dataset after adding an item by clicking the "Add" or "Remove" buttons?
What version of FUEL are you running? I have a project that uses select2 with add/edit and it's refreshing them. That said, select2s are a little different in that you have to destroy them and then recreate them:
I'm using select2 with add/edit in a repeatable (template) field and it's not adding new inline entries.