* Fix #17964

Some browsers are lazy when updating dom elements after transition effects. This can be fixed by reading element properties such as offsetHeight or offsetWidth. However, creating a function using the Function constructor just to access such element, results in a violation of Content Security Policy (where applied), which in turn crashes the application. This fix actually reverts to the way this was handled in v3 and should work as intended.

[skip sauce]
[skip validator]

Refs #19908.

[skip sauce]
[skip validator]

[skip sauce]
[skip validator]

Mostly KeyboardEvent.which and MouseEvent.which values.

[skip validator]

[skip validator]

Fixes #19878

[skip validator]

This allows for keyboard navigation (e.g. arrow keys left/right to
trigger different radio buttons) following an initial mouse click
interaction

Fixes #19028

[skip sauce]
[skip validator]

[skip sauce]
[skip validator]

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

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

[skip sauce]
[skip validator]

[skip sauce]
[skip validator]

[skip sauce]
[skip validator]

[skip sauce]
[skip validator]

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

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.