Changing data bound to Ember.Select doesn't update selection

[martinstein]

First of all, here's a jsfiddle that demonstrates the problem:

http://jsfiddle.net/KPXYd/4/

When the data behind the Select view changes, the options are correctly updated, but the new selected item is not selected. When stepping through the code, it seemed to me that the following happens:

1. The selectionBinding is updated first and the new selection gets highlighted (possibly on the old content ?)
2. The contentBinding is updated next, and thus the options get re-rendered and the highlighted selection gets 'lost'.

I'm not sure if the above is actually the cause. Maybe someone else can look into it.

[dlcurry]

Your example helped me immensely, so maybe I can pay back...

I had a very similar problem, but related to restoring Select(ed) values from persistance - the Selects wouldn't update. The following code doesn't seem to have any effect in your jsfiddle example, but I'm not a jsfiddle user yet, so maybe I'm not using it correctly.
this.user.set('group', europeGroups.findProperty('id', this.user.group.id));

The basic idea is that your user property DOES have the data, but the groups property no longer points to the group set at initialization as far as the Select is concerned. So you get the id of the group, get the associated group instance from xxxGroups, ans set that into user.group. This will also trigger the change event for the Select so that it refreshes....I think.
HTH,
Dave