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When a DOM node is passed to an HTML tooltip, the `title` node is only moved if it is not already in the tooltip. Otherwise, `empty()` is used instead of `detach()` before appending the `title` to avoid memory leaks. If a DOM node is passed to a plain text tooltip, its text is copied via jQuery `.text()`. Replaces `.detach()` with `.empty()`, as `.detach()` is almost never useful but instead leaks memory. The difference between `empty` and `detach` is that the latter keeps all the attached jQuery events/data. However, since we do not return the previous children, the user would have to keep these themselves, thus they can `detach()` if necessary. This is a port of https://github.com/twbs/bootstrap/pull/14552 to v4.
