Is there any way to undo moving comments to chat ?
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You probably talking about this.
You do not need to worry about this, it is a feature on the Stack Overflow that when you discuss on answer for more than 10 comments, it is automatically creates an discussion chat room for you and the person who has asked the question. Discussing in the chat room will be faster.
Moving comments to a chat room does not delete the original comments, so there is nothing to undo.