test: Wait for TypeaheadSelect to settle down before pressing keys

The TypeaheadSelect template code will focus the text input 100ms
after opening the menu. The tests generally aren't disturbed about
that, except when simulating key presses, of course.

When the focus unexpectedly shifts back to the text input while
navigating the menu items, the focused item is reset to either the
first or last one.

test/verify/check-lib

@@ -18,6 +18,7 @@
 # along with Cockpit; If not, see <https://www.gnu.org/licenses/>.
 
 import testlib
+import time
 
 
 @testlib.nondestructive
@@ -70,14 +71,27 @@ class TestLib(testlib.MachineCase):
         # Select with keys, verify that dividers and headers are skipped
 
         b.click("#demo-typeahead .pf-v5-c-menu-toggle__button")
+        # The PF typeahead template asynchronously moves the focus to
+        # the text input, and navigation would be yanked to the start
+        # or end of the menu.  Let's wait for this to be over.
+        time.sleep(1)
+
         b.wait_visible("#typeahead-widget")
+        b.wait_visible("#demo-typeahead input:focus")
         b.key("ArrowDown")
+        b.wait_text("#demo-typeahead :focus", "The Start")
         b.key("ArrowUp")     # wraps around
+        b.wait_text("#demo-typeahead :focus", "The End")
         b.key("ArrowUp")     # skips over divider
+        b.wait_text("#demo-typeahead :focus", "Wyoming")
         b.key("ArrowDown")   # skips over divider
+        b.wait_text("#demo-typeahead :focus", "The End")
         b.key("ArrowDown")   # wraps around
+        b.wait_text("#demo-typeahead :focus", "The Start")
         b.key("ArrowDown")   # skips over divider and header
+        b.wait_text("#demo-typeahead :focus", "Alaska")
         b.key("ArrowDown")
+        b.wait_text("#demo-typeahead :focus", "Alabama")
         b.key("Enter")
         b.wait_not_present("#typeahead-widget")
         b.wait_text("#value", "AL")