Inconsistent behaviour when jumping to the end of an element which is at the end of the virtual buffer

**Reported by erion on 2012-06-18 14:30**
When, for example, a table is at the very end of the virtual buffer, pressing comma results in NVDA jumping to the top of the document.
Since NVDA does not wrap to the top with other keys, this is inconsistent behaviour.
NVDA should announce that this element is the last one in the document and should not try jumping out of it.
