pt-fill unsupported in suggest/multiselect components

[siftikha]

Bug report or Feature Request

blueprintjs/select 2.0.0
Chrome, OSX

Steps to reproduce

Try to make a suggest/multiselect with pt-fill

Actual behavior

The multiselect or suggest fails to fill the container

Expected behavior

The multi-select or suggest ought to fill the container

[mindcrash]

I have achieved this partially by overriding .pt-popover-wrapper with a custom class and telling it to use the full width of whatever element it is sitting in:

.pt-popover-wrapper.ns-my-popover-wrapper {
 width: 100%;
}

The popover is still a bit of a pain however, because it is rendered within a portal outside of the tree (although something does seem to happen there because the arrow is moving towards the center when applying the style above).

[giladgray]

@mindcrash the arrow has a mind of its own. if you are able to not use a portal for this popover then you can easily size it to the button!