Gracefully handle changes on tables backed by ArrangeableMixin (or SortableMixin)

[leepfrog]

If you are using content that is backed by SortableMixin, you see unpredictable results when modifying the data in the table. To get around this, I'm having my tableController update whenever it notices a data change on the data source (to redraw the table), but it would be better if the table widget could understand if the indices in view have been modified.

[ppong]

@leepfrog this is interesting. definitely sounds like a bug. I will take a look at it

[go1dfish]

The issue seems to be the rowContent cache in Ember.Table.RowArrayProxy

The following workaround forces the cache to empty as the content array changes

Ember.Table.RowArrayProxy.reopen({
  rowContent: function() {
    return []; 
  }.property('content.@each')
});

With this fix the table appears to work fine when the row content changes after rendering.

[pkamenarsky]

This also happens when first removing and then adding rows at the end of the table, the added rows are then still bound to the old rowContent and thus render incorrectly. This fixes it, thanks very much.

[azirbel]

Closing this as out of date, since RowArrayProxy has been removed a while ago and I'm not sure how to reproduce the problem.