Comply to the new style.
carousel.js: remove unneeded variable assignment.

`slideIndex` is assigned to the same value a few lines above.
Minor style tweaks.
Run `grunt`.
Merge pull request #13627 from twbs/maybe-fix-12364

Hopefully fixes trigger focus restoration on modal close
set not-allowed cursor on disabled radio+checkbox labels; fixes #13281

[skip validator] [skip sauce]
add docs for #13745

Good catch @juthilo
[skip sauce]
Merge pull request #13388 from twbs/xhmikosr-js-style

Improve JS style
add failing test for #13268
put the tooltips into the DOM in the tooltip unit tests
don't show tooltips/popovers whose element isn't in the DOM; fixes #13268
Merge pull request #13752 from twbs/fix-13268

Proposed fix for #13268
there is no need for this.offsets and this.targets to be jQuery objects
no need to check for href attribute on the scrollable element
removing this.$element as it is a superfluous copy of this.$scrollElement
refactor scrollspy refresh method

Closes #13702 by merging a rebased version of it.
Merge branch 'mikegreiling-scrollspy-update'
Adds isolated visual tests for javascript plugins (decoupled from docs). This makes it
faster and easier to test/develop js functionality not represented in unit tests, and gives us
a playground for interactions, etc.

It also makes it so developing javascript is now decoupled form jekyll, which should make everything
faster and less painful.

This commit also reverts my filter commit https://github.com/twbs/bootstrap/commit/9900771aa7f1b3ddcee49aec84082104776ace70
which broke scrollspy for dropdowns.
Merge pull request #13744 from twbs/fix-13650

replace SemVer summary with a link to its website
fixes #13210: clean up tooltip example