fix: make select inverse a no-op when nothing is selected - #32
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fixes #31
return early from
Selection::invertwhen nothing is selected, and skip the command entirely so it does not push a history entry that changed nothing.deliberately does not touch the inactive-means-full-coverage convention in
coverage(). that convention is what lets edits reach the whole canvas and is relied on throughout the editing paths; inverting is the caller that was wrong about it.no-op rather than select-all, matching photoshop.
before
after