With that commit applied, Ctrl+PgUp/PgDn changes the visually selected room in the sidebar, but the main view does not update. This is accompanied by an error printed to the console: qrc:/RoomList/Page.qml:70: TypeError: Cannot call method 'trigger' of null Clicking on sidebar list items still works to switch rooms. Reverting that commit fixes the issue.
Fixed by Carl Schwan with https://invent.kde.org/network/neochat/-/commit/489979af43a60610da522079c840ba76cff9806c.