button-variant mixin - calculating active color

[jan-vodila]

Hi, guys

I thinks that button-variant mixin should calculate color property for hover state from its $active-background variable not the $background var. The problem is when I want a black button to change its background-color to white it leaves the color property also white not black as I would expected.

See here:

bootstrap/scss/mixins/_buttons.scss

Line 13 in 27637cf

@include color-yiq($background);

What do you think?

[mdo]

Fixed by #23657.