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.
Gimp-developer mailing list