Support grid-auto-flow: column

[LukasKlement]

The new Grid support is great! In order to enable a grid to flow in a vertical direction, support for the property grid-auto-flow is needed.

The CSS needed to be supported would be along those lines:

.container {
  display: grid;
  grid-template-rows: 1fr 1fr 1fr;
  grid-auto-flow: column;
}

[LukasKlement]

@grewn0uille I'd be happy to sponsor development on this issue. Please let me know your thoughts.

[grewn0uille]

@LukasKlement We’d be happy too :) Could you send us a mail?

[LukasKlement]

@grewn0uille I did on 1 May and 6 May.

[grewn0uille]

@LukasKlement Mmh, we just spoted a misconfiguration of mails… Could you please resend it?
Sorry for the inconvenience.