>   Assume I have a selection on small area (for instance a 20px
> circle),
> and I invert it. Now, if I grow the selection by a sufficient amount
> (10px in this case), everything gets selected.
> Is there a practical, fast way, to detect this case, i.e, that the
> selection covers the whole layer (or image?) and that no pixels remain
> unselected? I assume that inverting the selection again and testing
> for
> empty would work, but that would be two selection inversions in the
> normal case and that may be a bit costly.




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