Announce the initial row in unselected GTK menus

internal/atspi/adapter_events.c

@@ -219,6 +219,44 @@ AtspiAccessible *cthulhu_table_selected_child(AtspiAccessible *source) {
     return child;
 }
 
+// GTK lists populated through stdin can have no selected row at focus time.
+// Their first navigation starts at row zero. Present that initial row without
+// selecting it or moving the application's cursor. Selection-change queries
+// must continue to return only actual selections.
+AtspiAccessible *cthulhu_table_focus_child(AtspiAccessible *source) {
+    AtspiAccessible *child = cthulhu_table_selected_child(source);
+    if (child != NULL) return child;
+    gchar *toolkit = atspi_accessible_get_toolkit_name(source, NULL);
+    gboolean gtk = g_ascii_strcasecmp(toolkit != NULL ? toolkit : "", "gtk") == 0;
+    g_free(toolkit);
+    if (!gtk) return NULL;
+    AtspiStateSet *states = atspi_accessible_get_state_set(source);
+    gboolean initial = states != NULL &&
+        atspi_state_set_contains(states, ATSPI_STATE_FOCUSED) &&
+        !atspi_state_set_contains(states, ATSPI_STATE_MULTISELECTABLE);
+    if (states != NULL) g_object_unref(states);
+    if (!initial) return NULL;
+    AtspiTable *table = atspi_accessible_get_table_iface(source);
+    if (table == NULL) return NULL;
+    GError *error = NULL;
+    gint selected = atspi_table_get_n_selected_rows(table, &error);
+    if (error == NULL && selected == 0 && atspi_table_get_n_rows(table, NULL) > 0 &&
+        atspi_table_get_n_columns(table, NULL) == 1) {
+        child = atspi_table_get_accessible_at(table, 0, 0, NULL);
+        if (child != NULL) {
+            states = atspi_accessible_get_state_set(child);
+            gboolean showing = states != NULL &&
+                atspi_state_set_contains(states, ATSPI_STATE_SHOWING) &&
+                !atspi_state_set_contains(states, ATSPI_STATE_DEFUNCT);
+            if (states != NULL) g_object_unref(states);
+            if (!showing) { g_object_unref(child); child = NULL; }
+        }
+    }
+    g_clear_error(&error);
+    g_object_unref(table);
+    return child;
+}
+
 // Resolve the focused descendant at a window-activation boundary. Providers
 // such as Steam's Chromium UI can activate a frame without emitting a usable
 // object-focus event. Keep the synchronous callback work bounded so a broken