Ensure that hidden event is sent when content is really hidden (collapsing class is removed)
Revert "Use mousedown instead of click for backdrop click detection; fixes #13816"
Remove `aria-describedby` attribute later

Fixes #14241
Collapse: count `.collapsing` elements as actives; closes #13447
Fix hover-tooltip flickering when mouse re-enters

- is(':visible') seems to be the only reliable check, without a refactoring of how hoverState is used
- tests need improvement
Add section to docs explaining our stance on validators
Address #14541 by tweaking badge docs

* move unrelated .btn-primary example out of the pills subsection
* remove excessive .nav-stacked example
Merge pull request #14543 from twbs/validation-docs

Add section to docs explaining our stance on validators
Merge pull request #14546 from twbs/address-14541

Address #14541 by tweaking badge docs
Fixes #14545: Avoid strange formatting on vendor prefixing for placeholder
Merge pull request #14273 from sgonyea/master

Fix hover-popover/tooltip flickering when mouse re-enters
Handle lack of .width and .height from getBoundingClientRect() in IE8

Closes #14093
Correction to #14090
Relevant docs: https://developer.mozilla.org/en-US/docs/Web/API/Element.getBoundingClientRect#Browser_compatibility
Update dependencies.
Run `grunt`.
Fix bug not re-calculating scrollbar width when opening modal.

If opening a modal when a scrollbar is present, closing it, then
resizing the window so the scrollbar disappears, then opening the
modal again, the content would shift. This fixes the problem by
always calculating the scrollbar width every time a modal is opened.

Closes #14357.
Merge branch 'stefansundin/master'
Properly hide checkbox and radio inputs in button groups

`pointer-events: none;` for modern browsers (including IE11+), `clip: rect(1px, 1px, 1px, 1px);` for everything else.

Fixes #14137
grunt
Fixes #14319: Prevent jumbotron reflow by ensuring padding of .container isn't interferred with by .jumbotron side padding
customizer: minor cleanup of IE8 error messaging code

[skip sauce]