#4 Moveing element with child elements causes open HLE to clos

[Charles Schmidt]

Because of how moves occur (a copy of the source then deletion of the source), a moved element is actually a completely different BenchmarkElement at the end. We currently update ownership of High Level Editor for the root element so that it will appear unaffected if it is moved. However, if this element contains child elements, these too will be recursively copied (and deleted with their former parent). No similar change in ownership of HLE for the children will occur therefore these windows will simply close when the move ends.