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It can be tested in any list or not calculated collection with many properties.
Curiously it does not fail with calculated collections.
It only fails with IE9. It works with IE8 and of course with all other browser.
This is inevitable.
The problem is that overflow: auto; does not work fine with IE9 producing a still worse problem. So we opted for adding overflow-x: scroll; when we cosider the collection is weight enough and nothing otherwise, the later for avoiding to show the scrollbar always.
In this way it look nice most times, but from time to time our algorithm will fail, so we have an unnecessary scrollbar or well the data is out of the frame (this bug).
The current solution is a good compromise.
The code for this is org.openxava.web.Lists.getOverflow()