This reverts commit 1b323762.
This reverts PR #14189 because it caused major regressions.

Fixes #15168.

We'll try to revisit #14167's feature request in Bootstrap v4.

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Special thanks to @programcsharp

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Fixes #15084.

Fixes #13636.

Fixes #14851

This would only work with transitions but since we disable them for unit tests, this delivers unreliably results.

Fixes #14375.
Closes #14519 by merging it.

Fixes #14167.
Closes #14189 by merging it.

Closes #13563 by merging it.

Added support for `aria-expanded` toggling via JavaScript. Added
`aria-controls`, `aria-expanded`, `aria-labelledby` to tabs docs.

Added `aria-expanded` unit test for the tabs plugin.

See also #13554.

Closes #14154 by merging it.

Closes #14772.

Fixes #14756.
Closes #14767.

also includes tiny fix/clarification to two existing unit tests for the
.active class, adding data-toggle=“button” explicitly to the tested
buttons

Closes #14819.

Fixes #14844.
Closes #14845.

Also adds unit tests for keyboard events.

Fixes #14468.

Fixes #14561. Big thanks to @wickstargazer.

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Fixes #14553.

Fixes #11967.

Fixes #14322.
Closes #14581.

Leaking tooltips across tests leads to confusion and sadness.

Fixes #13696.
Fixes #13696.
Fixes #14197.
Closes #13718.

Added handling of aria-expanded=true/false to collapse.js, updated
documentation to include advice on making expand/collapse controls
accessible, updated examples and javascript documentation to use
aria-expanded and aria-controls (when targetting single collapsible
element, using ID rather than class selector)

Closes #14147.
Closes #14153.

- is(':visible') seems to be the only reliable check, without a refactoring of how hoverState is used
- tests need improvement

Fixes #14450