Mulit selection and move

First, thanks to all for your hard work.

Issue: When I select multiple nodes and shift to move as a group, all the nodes stack on top of each other when I let go of shift and there is no undu.

C:\ComfyUI_windows_portable>.\python_embeded\python.exe -s ComfyUI\main.py --windows-standalone-build
** ComfyUI startup time: 2023-12-30 08:31:41.315934
** Platform: Windows
** Python version: 3.11.6 (tags/v3.11.6:8b6ee5b, Oct 2 2023, 14:57:12) [MSC v.1935 64 bit (AMD64)]
** Python executable: C:\ComfyUI_windows_portable\python_embeded\python.exe
** Log path: C:\ComfyUI_windows_portable\comfyui.log

Prestartup times for custom nodes:
0.0 seconds: C:\ComfyUI_windows_portable\ComfyUI\custom_nodes\ComfyUI-Manager

Total VRAM 23028 MB, total RAM 130206 MB
Set vram state to: NORMAL_VRAM
Device: cuda:0 NVIDIA GeForce RTX 4090 : cudaMallocAsync
VAE dtype: torch.bfloat16
Using pytorch cross attention
### Loading: ComfyUI-Impact-Pack (V4.54.2)
### Loading: ComfyUI-Impact-Pack (Subpack: V0.4)
### Loading: ComfyUI-Inspire-Pack (V0.54.1)
[Impact Pack] Wildcards loading done.
### Loading: ComfyUI-Manager (V1.17.1)
### ComfyUI Revision: 1860 [c7821444] | Released on '2023-12-27'