button group has additonal border

[danielleroux]

I'm submitting a...

[x] Bug report
[ ] Feature request
[ ] Documentation issue or request

Current behavior

Expected behavior

No doubled border in button group

[danielleroux]

/cc @silviowolf

[goncalosard]

@danielleroux @silviowolf
Made a branch with a possible fix ( fix/button-borders ).

Now when in a group, every button doesnt have a right border exepect the last one. Also another fix is we can make the middle buttons have the right and left borders halfed, making a normal border when two buttons are together.

At the moment the result is the following:

[danielleroux]

@goncalosard lgtm to disable right border. I don't see any edge cases where this fix is not working