[DropDowns] Combobox/MultiSelect with virtualization display empty rows when last item is selected and then opens again

[iadnonov]

When having a Combobox with virtual scroll enabled, display empty rows when last item is selected and then Combobox opens again.

Ticket ID: 1586664

This can be reproduced here: https://stackblitz.com/run/?file=app%2Fmain.jsx

Steps to reproduce

1. Open combobox
2. Scroll to end of the item list
3. Select last item 4999
4. Open combobox again

Current behaviour

List is opening without any items in it

Expected behaviour

List is opening with list of items

[kdikov82]

The same issue is reproduced without selection and only scrolling to the last item, closing the popup and opening it again: https://stackblitz.com/edit/react-ny5ufm?file=app%2Fmain.jsx

The problem is also replicated with the MultiSelect: https://stackblitz.com/edit/react-twrp63?file=app%2Fmain.jsx

[kdikov82]

Public item for the MultiSelect: https://feedback.telerik.com/kendo-react-ui/1590786-multiselect-with-virtualization-shows-blank-popup-when-scrolled-to-the-bottom-and-reopened

[WissamProgress]

Reported in Ticket ID: 1623500

[elena-gancheva]

related to #2446

[filipKovachev]

Reproducible for the MultiColumnComboBox as well https://stackblitz.com/edit/react-s5d5pk?file=app%2Fmain.tsx

Reported in Ticket 1640409

[elena-gancheva]

The fix is available in the latest dev version of the package and will be available in an official release version on 15th May