- 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.

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Closes #18543

Refs #14368

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Fixes #18044

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Refs #15947, #17542

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This reverts commit 61067304.

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

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Refs #18178

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

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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