I've been wondering how to ask whether a frame is visible to the
end-user or not. Just "can the user see it?", and ideally also, "What
rectangle from the frame gets painted, if a piece of the frame is
cropped?" I've already got the nsIFrame object, in our modified spatial
navigation code from Mozilla 1.8.
I'm getting really tired of trying to figure out if something's visible
from computed styles, box objects, and client rects. :-)
Alex
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