29b546fe7f
wrong button. Works by adding a flag to transform operators "remove_on_cancel". This is currently only used for node transforms, the idea is that if set, the operator will remove the transformed elements when it is cancelled. It's not possible to do that in the original NODE_OT_add_node operator, because transform is modal and there is no way of reacting to a cancel outside of the transform itself (previous attempt used a macro operator, but that also doesn't work because subsequent operators don't get executed if the previous transform cancels).