dnd: Don't call Arc::get_mut
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The caller of `start_dnd` may also have a reference, so this can panic. Either the public API shouldn't take an `Arc` or this should be avoided. There doesn't seem to be any reason this is needed anyway.
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The caller of
start_dndmay also have a reference, so this can panic. Either the public API shouldn't take anArcor this should be avoided.There doesn't seem to be any reason this is needed anyway.