Broken layout when InputGroup is used within FormLayout

[mbohal]

When <InputGroup> is used within <FormLayout> it breaks when there is not enough space.

When used outside of <FormLayout> the <InputGroup> maintains width and overflows:

I think this is the correct behavior.

However when used inside of <FormLayout> and when the last element is a <Button> it breaks:

[AhmAlkalii]

Hi can i work on this?

[mbohal]

@AhmAlkalii If you are willing to make a PR, it would be greatly appreciated.