Popup: closed on trigger blur even when portal content is focused

[vlsergeyatsbt]

Bug Report

Steps

• create popup with input as trigger (with on="focus") and second input as popup content
• click on input to show popup
• click on input in popup

Expected Result

• second input focused, popup is still open

Actual Result

• popup closed

Version

• works correctly on 0.81.1, 0.81.3
• does not work correctly on 0.82.0

Testcase

https://codesandbox.io/s/9yv949y13o

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[vlsergeyatsbt]

I think i've found the source of problem. In version 0.82.0 there is no "rootNode" variable in portal component. Thus the following check always returns undefined:

const didFocusPortal = _.invoke(this, 'rootNode.contains', e.relatedTarget)

i think this check need to rewritten into

const didFocusPortal = _.invoke(this, 'portalNode.contains', e.relatedTarget)

this way it works for 0.82.0

[levithomason]

The proposed bug location appears correct. Want to make a PR?