It's not important to me, at least not at this time (and I could probably put
together a macro myself to do so if it became necessary). And a little bit of
testing suggests that it may not be as necessary as I had thought. I had
originally thought that valid off-screen content might be there because it
might be animated to enter(with a motion path,e.g.), but a quick test
revealed that any object off-screen set to animate, even if the animation
remains completely off-screen, will not be included in the shapes found by
using that function. So I wouldnt' be as worried about using the 'Remove All'
function as I had originally thought.