Multiselect fields don't work in widget admin

[brendanlawton]

Steps to Reproduce Issue:

Add a wigdet that uses multiselect fields - in the admin panel - to a tailored page Make a selection in the multiselect field

Expected Behaviour:

Save button is enabled when selection is made and the view re-renders to match the selection.

Actual Behaviour:

Save button does not enable when selection is made and view does not re-render, therefore any changes to the multiselect field cannot be saved.

[andrew-worsfold]

@brendanlawton -

Which widgets with a multiselect field are you using?

[brendanlawton]

@andrew-worsfold tested with my own custom widgets and then tried this commercial one: ultimate posts widget