[bug] MultiDrag plugin breaks group rule

[lchrennew]

Describe the bug

MultiDrag plugin with avoidImplicitDeselect can easily breaks group rule when selection is cross-lists.

To Reproduce Steps to reproduce the behavior:

1. Go to https://jsbin.com/qabatit/1/edit?html,css,js,output
2. Hold alt key and click items from the 3 lists to make a cross list selection
3. Drag & sort the selected items between lists
4. See error

Expected behavior

Each group should be isolated, that means when you drag the selected items in group A should exclude the items in group B

Information

Versions - Look in your package.json for this information: sortablejs = ^1.15.0

Reproduction jsbin : https://jsbin.com/qabatit/1/edit?html,css,js,output