Horizontal x-collapse?

[acalvino4]

Is it possible to use the x-collapse directive for a horizontal show/hide scenario? If not, consider this a feature request! (unless maybe it's not even needed in that case...)

[grey4owl]

I created a PR(#3949) that enables this with a modifier .horizontal, default is .vertical but you don't have to specify it.

x.collapse.duration.1000ms || x-collapse.vertical.duration.1000ms collapse vertically on height of the element
x.collapse.horizontal.duration.1000ms collapse horizontally on width of the element