Optimize U2 to avoid adding child elements in select() after parent has already been unloaded.
Optimize U2 to avoid adding child elements in select() after parent has already been unloaded.

foam-framework/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm,jacksonic/vjlofvhjfgm,foam-framework/foam2,foam-framework/foam2,foam-framework/foam2,jacksonic/vjlofvhjfgm