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

tests/gtk_panel_applet.py

@@ -0,0 +1,93 @@
+#!/usr/bin/env python3
+# Copyright (c) 2026 Storm Dragon
+# Authors: Storm Dragon, Angus Kola
+# SPDX-License-Identifier: GPL-3.0-or-later
+"""Real GTK socket/plug embedding on separate providers for private tests."""
+import ctypes
+import os
+import sys
+
+import gi
+
+gi.require_version("Gtk", "3.0")
+gi.require_version("Atk", "1.0")
+gi.require_version("GdkX11", "3.0")
+from gi.repository import Atk, GdkX11, GLib, Gtk
+
+
+mode = sys.argv[1]
+processName = "mate-panel" if mode == "panel" else "applet" if mode == "standalone" else mode
+GLib.set_prgname(processName)
+if ctypes.CDLL(None).prctl(15, processName.encode(), 0, 0, 0) != 0:
+    raise RuntimeError("cannot set fixture process name")
+window = Gtk.Plug.new(int(sys.argv[2])) if mode == "applet" else Gtk.Window()
+if mode == "applet":
+    window.connect("delete-event", lambda *_args: True)
+if mode == "standalone":
+    Atk.get_root().set_name("mate-panel")
+window.set_title("Embedded applet fixture " + mode)
+window.set_default_size(400, 120)
+box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
+window.add(box)
+socket = None
+if mode in ("applet", "standalone"):
+    box.get_accessible().set_role(Atk.Role.PANEL)
+    box.get_accessible().set_name("Network applet")
+    first = Gtk.Button(label="Network")
+    first.get_accessible().set_role(Atk.Role.ICON)
+    first.get_accessible().set_name("")
+    second = Gtk.Button(label="Applet settings")
+    box.add(first)
+    box.add(second)
+elif mode == "editor":
+    first = Gtk.Entry()
+    first.get_accessible().set_name("Editor entry")
+    box.add(first)
+else:
+    first = Gtk.Button(label="Before applet")
+    second = Gtk.Button(label="After applet")
+    socket = Gtk.Socket()
+    box.add(first)
+    box.add(socket)
+    box.add(second)
+barrier = Gtk.Label()
+barrier.get_accessible().set_role(Atk.Role.ALERT)
+box.add(barrier)
+window.show_all()
+pendingInput = ""
+
+
+def receive_command(_source, _condition):
+    global pendingInput
+    content = os.read(sys.stdin.fileno(), 4096)
+    if not content:
+        Gtk.main_quit()
+        return False
+    pendingInput += content.decode()
+    while "\n" in pendingInput:
+        command, pendingInput = pendingInput.split("\n", 1)
+        if command == "first":
+            first.grab_focus()
+        elif command == "second":
+            second.grab_focus()
+        elif command == "stale":
+            first.get_accessible().notify_state_change(Atk.StateType.FOCUSED, True)
+            barrier.set_text("")
+            barrier.set_text("Applet barrier")
+        elif command == "detach":
+            socket.destroy()
+            barrier.set_text("Detached host barrier")
+        elif command.startswith("edit "):
+            first.set_text(command.removeprefix("edit "))
+            first.grab_focus()
+        elif command == "quit":
+            Gtk.main_quit()
+            return False
+    return True
+
+
+GLib.io_add_watch(sys.stdin, GLib.IO_IN | GLib.IO_HUP, receive_command)
+GLib.idle_add(lambda: print(
+    "ready", GdkX11.X11Window.get_xid(window.get_window()),
+    socket.get_id() if socket is not None else 0, flush=True) or False)
+Gtk.main()

tests/gtk_window_switcher.py

@@ -24,6 +24,9 @@ if providerName == "marco":
         raise RuntimeError("cannot set fixture process name")
 
 window = Gtk.Window(title="Switcher fixture " + providerName)
+# Label updates must not resize the foreground window while the test compares
+# its full X11 snapshot to check that the switcher has not taken ownership.
+window.set_default_size(400, 100)
 if providerName == "marco":
     window.set_accept_focus(False)
     window.set_focus_on_map(False)