Dropdown: multiple selection does not handle selectedIndex properly

[layershifter]

Bug Report

Steps

1. Click on Dropdown to open
2. Navigate via ↓ to "Ruby"
3. Press Enter

Expected Result

selectedIndex will remain on next item, i.e. "UI Design"

Actual Result

selectedIndex was moved the first item and is hidden from user:

Next press of ↓ will move view up to the second item.

Version

1.0.0

Testcase

https://codesandbox.io/s/iqty7?module=/example.js

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