[ci skip]

- Rename -height to -height-base to match other vars
- Drop use of -height across the board and rely on it to be inherited
- Adjust padding of .dropdown-header to account for different line-height of h6 heading element (this needs refactoring for variables and rems also)

Revert "fixes #17379: override search input box-sizing to match our global overrides"

This reverts commits 468a9d93 & 57998dc2.

https://github.com/necolas/normalize.css/pull/496 has made this override unnecessary.

[skip sauce]

Closes #18543

Refs #14368

[skip sauce]
[skip validator]

[ci skip]

Fixes #18044

[skip sauce]
[skip validator]

Refs #15947, #17542

[ci skip]

This reverts commit 61067304.

The normalize.css pull request (https://github.com/necolas/normalize.css/pull/379 )
was REJECTED, *NOT* merged!

[skip sauce]

Refs #18178

[ci skip]

Refs #15947
Somehow c256aca1 got lost during the SCSS translation...

[skip sauce]

They can be rounded later on if $enable-rounded: true.

Perhaps I'm a little slow & need to have things spelled out :)
https://github.com/twbs/bootstrap/issues/17301#issuecomment-134469886

Fix #17052

See https://github.com/twbs/bootstrap-sass/pull/805