Pager in ComboBox dropdown loses focus with interaction

[fabriciomurta]

Found: 4.8.1 Ext.NET forum thread: Combobox Search issues with Chrome and Ext.NET 4.8.1

Interacting with pager buttons in combo boxes having a pager similar to the grid paging plugin (when the PageSize config is specified and more than the page size's entries are in the display) results in lost focus in the dropdown at least as of version 74.

This can be promptly reproduced on the EE example: https://examples4.ext.net/Examples/Form/ComboBox/Custom_Search/

1. Enter * in any of the combo boxes input field
2. Switch pages, in the displayed dropdown, forward and back

Eventually, the dropdown will get dismissed, seemingly after a load event finishes (the grid goes gray on the load mask, then it is dismissed, not dismissed right on clicking a button).