.btn-<sm/lg> definitions in _buttons.scss doesn't use $input-btn-line-height-<sm/lg> variable in Bootstrap 4 beta 1

[dozer75]

The new variables $input-btn-line-height-sm/$input-btn-line-height-lg has been introduced in the latest beta of Bootstrap 4, but this isn't used by the .btn-sm/.btn-lg definition in _buttons.scss, this uses general $line-height-sm/$line-height-lg.

The $input-btn-line-height-sm/$input-btn-line-height-lg should also be defined to default beeing $line-height-sm/$line-height-lg

The .btn definition uses the correct $input-btn-line-height.

[mdo]

True, those are used everywhere else, but not in the _buttons.scss file.

[mdo]

First and last paragraphs have been resolved already, but just added a commit in #24199 to fix the middle paragraph's issue.