Alex Grant created WICKET-4590:
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             Summary: Palette does not display a single unselected item
                 Key: WICKET-4590
                 URL: https://issues.apache.org/jira/browse/WICKET-4590
             Project: Wicket
          Issue Type: Bug
    Affects Versions: 1.5.7
            Reporter: Alex Grant


In Wicket 1.5.7, if you have a Palette where the choices model returns one 
object and the (selected) model returns zero objects, the palette will appear 
empty.

I believe this was a result of the change in WICKET-4528. In the method 
Recorder.updateIds, it used to look like this

        private void updateIds(final String value)
        {
                if (Strings.isEmpty(value))
                {
                        ids = EMPTY_IDS;
                }
                else
                {
                        ids = value.split(",");
                }
        }

Now it looks like this

        private void updateIds(final String value)
        {
                getSelectedIds().clear();

                for (final String id : Strings.split(value, ','))
                {
                        getSelectedIds().add(id);
                }
        }

Which means that if value is "", Strings.split returns one empty string, so 
getSelectedIds() contains one empty string, resulting in getUnselectedList() 
deciding that the selected and choices lists are both size one and therefore 
there is nothing available to display in the unselected list.

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