Split button dropup/ right/ left carets are misaligned

[ysds]

Dropdown is OK, but dropup / right / left carets seems to be misaligned.

Demo: https://codepen.io/anon/pen/oEapLg

Docs: http://getbootstrap.com/docs/4.0/components/dropdowns/#dropup-variation

[alecpl]

All these :after elements should use vertical-align:middle.

[ysds]

@alecpl My point is horizontal alignment. The current CSS seems to have lack of alignment overwrite of horizontal direction. I have already created a PR #25719 to fix this.