.btn-link.active shouldn't be box-shadowed

[b1rdex]

How to reproduce: <button class="btn btn-link active">test</button> and you got very bad looking box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125) on it. Works bad for <a> too. Here is screenshot:

Can be fixed with :none:

.btn.active
   box-shadow: none
   &:not(.btn-link)
     box-shadow: inset 0 3px 5px rgba(0, 0, 0, 0.125)

[djch]

I'm not really sure what the use case would be for making a btn-link look active. That said it would be pretty easy to add .active to the same declaration which resets the box-shadow for :active.

https://github.com/twbs/bootstrap/blob/master/less/buttons.less#L93-L99

[b1rdex]

If this link becomes underlined on hover, why shouldn't it have active state with .active class like all the other .btns?

[cvrebert]

CC: @mdo to make the design decision

[mdo]

Shadow shouldn't be there.