More work on cthulhu recognizing focused items that should be read.

internal/atspi/adapter_events.c

@@ -609,37 +609,68 @@ gboolean cthulhu_may_be_background_notification(AtspiAccessible *source) {
 
 // Return the containing top-level window. An embedded web dialog is part of
 // its frame; a standalone dialog directly below the application owns itself.
+// GTK plugs also publish a frame, but its parent chain crosses the socket's
+// provider before reaching the host window. Keep that host as the owner while
+// retaining the source object's provider identity. Same-provider nested frames
+// retain their existing nearest-window behavior.
 AtspiAccessible *cthulhu_window_ancestor(AtspiAccessible *source) {
 	if (source == NULL) return NULL;
 	AtspiAccessible *current = g_object_ref(source);
+	AtspiAccessible *window = NULL;
 	for (gint depth = 0; current != NULL && depth < 256; depth++) {
 		GError *error = NULL;
 		AtspiRole role = atspi_accessible_get_role(current, &error);
 		if (error != NULL) {
 			g_clear_error(&error);
 			g_object_unref(current);
+			if (window != NULL) g_object_unref(window);
 			return NULL;
 		}
-		if (role == ATSPI_ROLE_FRAME || role == ATSPI_ROLE_WINDOW) {
-			return current;
+		if (role == ATSPI_ROLE_APPLICATION) {
+			g_object_unref(current);
+			return window;
+		}
+		if ((role == ATSPI_ROLE_FRAME || role == ATSPI_ROLE_WINDOW) &&
+			(window == NULL || g_strcmp0(cthulhu_accessible_bus_name(window),
+				cthulhu_accessible_bus_name(current)) != 0)) {
+			if (window != NULL) g_object_unref(window);
+			window = g_object_ref(current);
 		}
 		AtspiAccessible *parent = atspi_accessible_get_parent(current, &error);
+		// Only a frame with parents below the application can be a plug.
+		// Refresh that chain to reject detached sockets, without invalidating
+		// every ordinary top-level window for every accessibility event.
+		if (window != NULL && parent != NULL && error == NULL &&
+			atspi_accessible_get_role(parent, NULL) != ATSPI_ROLE_APPLICATION) {
+			g_object_unref(parent);
+			atspi_accessible_clear_cache_single(current);
+			parent = atspi_accessible_get_parent(current, &error);
+		}
         // Qt can expose a top-level QWidget as a filler rather than a frame.
         // Python's Qt utilities use the application-child boundary here.
         if (parent != NULL && error == NULL && role != ATSPI_ROLE_APPLICATION &&
             atspi_accessible_get_role(parent, NULL) == ATSPI_ROLE_APPLICATION) {
             g_object_unref(parent);
-            return current;
+            if (window == NULL || g_strcmp0(cthulhu_accessible_bus_name(window),
+                    cthulhu_accessible_bus_name(current)) != 0) {
+                if (window != NULL) g_object_unref(window);
+                return current;
+            }
+            g_object_unref(current);
+            return window;
         }
         g_object_unref(current);
 		if (error != NULL) {
 			g_clear_error(&error);
 			if (parent != NULL) g_object_unref(parent);
+			if (window != NULL) g_object_unref(window);
 			return NULL;
 		}
 		current = parent;
 	}
 	if (current != NULL) g_object_unref(current);
+	if (current == NULL) return window;
+	if (window != NULL) g_object_unref(window);
 	return NULL;
 }