how to prevent removing drag item from parent list?

[MBagherii]

I want to drag and drop li elements from source list to destination list but i don not want when drag and drop was done elem remove from source list for example source list : li1 li2 li3

now after drag and drop li1 source list become: li2 li3

but the thing i axpect is source list should not change and should remain like bellow: li1 li2 li3

and the destination list become: li1

how can i do this?

Actual behavior

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