FlowEditor's Rearrange Nodes Button Can Only Take Effect Once

As shown in the title, FlowEditor's Rearrange Nodes button can only take effect once. When I first use it, it is effect, but if I move some node then, it will be uneffect, even if save or deploy if.

solution:

add onNodeDragStop for <ReactFlow> and use setElements save node change

#264 is this issue's PR