Ensure wxGenericListCtrl item selected from keyboard is visible

When using the keyboard to select an item by typing the first characters of
its name, we need to make the item visible in addition to selecting it.

See #16336.

(cherry picked from commit 306597c4fa)

src/generic/listctrl.cpp

@@ -2994,6 +2994,7 @@ void wxListMainWindow::OnChar( wxKeyEvent &event )
                     SetItemState(item,
                                  wxLIST_STATE_FOCUSED | wxLIST_STATE_SELECTED,
                                  wxLIST_STATE_FOCUSED | wxLIST_STATE_SELECTED);
+                    EnsureVisible(item);
 
                     // Reset the bell flag if it had been temporarily disabled
                     // before.