When moving a cursor it's far easier to drag all the way to a corner than to drag to an icon (since it still matches if you overshoot).
Therefore it would be good if dragging a blob all the way to the bottom-left corner (or beyond!) was the same as dragging it to the bin - maybe move the bin icon so it has no padding, maybe just respond to that as a special case?
When moving a cursor it's far easier to drag all the way to a corner than to drag to an icon (since it still matches if you overshoot).
Therefore it would be good if dragging a blob all the way to the bottom-left corner (or beyond!) was the same as dragging it to the bin - maybe move the bin icon so it has no padding, maybe just respond to that as a special case?