Breaking layout when data-open is false

[lucasghizoni]

Hello, I would like to know why you guys used the following code on date-input-polyfill.scss:

&[data-open="false"] {
visibility: hidden;
z-index: -100 !important;
top: 0;
}

Instead of just using this:

&[data-open="false"] {
display: none;
}

I am questioning that, because the date-input-polyfill Element is occupying some space when attribute data-open is false, breaking my layout. If you agree with this little change, i make a pull request.

[jcgertig]

try it in a fork and see how it goes if everyting is working correctly make a pr