System keyboard shows up on initial open on ComboBox adaptive mode

[iadnonov]

When user open Combobox in a mobile device, search filed is focused and system keyboard opens. This way keyboard hide part of listed items.

Step to reproduse

• Open a ComboBox in a mobile device

Current behavior

The popup search input is focused and system keyboard opens

Expected behavior

The popup search input should not focus, and system keyboard should not open

Reported in ticket: 1606809