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Modal: Ignore spurious `focus` event that Firefox fires at `document` when switching back to its tab

Fixes #18365
Refs https://bugzilla.mozilla.org/show_bug.cgi?id=1228802

See also https://bugzilla.mozilla.org/show_bug.cgi?id=1228802

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Errata from:
* 8ce5da30
* 5d3144e8
which missed a few numbers.

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Now that we don't support IE 8 it's safe to do that.

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Avoids cycling carousels when the page isn't visible.
Closes #17710
Refs #15566

That way, ESLint won't look in parent dirs for configuration files.

We want to sum two numbers, not concatenate their stringifications.
Closes #17457 by merging a tweaked version of it.

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.

fixes #17097: Go back to using jQuery's text and html methods since innerText is nonstandard and not present in Firefox

Closes #17272 by merging a tweaked version of it.

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