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* HasItems.setItems(T... items) should allow edits
Arrays.asList() creates a immutable Arrays.ArrayList, preventing users from doing dataProvider.getItems() and updating the returned collection. This makes it impossible to keep the same data provider, update it and keep the filters & sorting, and then just call dataProvider.refreshAll() to get changes visible. We should not require users to create a new data provider in this case.
This is the same for DataProvider.ofItems(T... items)
* fix missing whitespace from test error message
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