Undelete a conversation in Messages

That's a great workaround. Thanks Brian!

I wish Apple would fix the underlying problem. Cmd-delete is already overloaded - it normally just deletes the current line of text. It shouldn't also do something that is irrevocable like delete the entire conversation. I would think if it is so easy to delete conversations with a keyboard shortcut, then Apple should

1. Give a warning: "are you sure you want to delete this conversation?" and have a checkbox to disable the warning.
2. Make it undo-able like it is with other operations like deleting messages in Mail
3. Make the shortcut key something that's not the same as a normal operation that is completely different
4. Some combination of the first 3.