#3930 workaround for older python versions

we have to import from 'typing_extensions' and add the package dependency..

packaging/debian/xpra/control

@@ -105,6 +105,7 @@ Architecture: any
 Depends: ${misc:Depends}, ${python3:Depends}, ${shlibs:Depends}
         ,python3-gi
         ,gir1.2-glib-2.0
+        ,python3-typing-extensions
 Recommends:
         ,${x11:Depends}
 # generate QR codes for authentication and connection URLs:

packaging/rpm/xpra.spec

@@ -98,6 +98,7 @@ BuildRequires:		pandoc
 BuildRequires:		which
 Requires:			python3
 Requires:			python3-gobject
+Requires:			python3-typing-extensions
 %if 0%{?el8}
 BuildRequires:		python3-dataclasses
 Requires:			python3-dataclasses

xpra/client/gl/gl_drivers.py

@@ -5,7 +5,8 @@
 # Xpra is released under the terms of the GNU GPL v2, or, at your option, any
 # later version. See the file COPYING for details.
 
-from typing import Dict, Tuple, TypeAlias
+from typing import Dict, Tuple
+from typing_extensions import TypeAlias
 
 #These chipsets will use OpenGL,
 #there will not be any warnings, even if the vendor is greylisted:

xpra/net/common.py

@@ -5,7 +5,8 @@
 
 import os
 import threading
-from typing import Tuple, Callable, List, Dict, TypeAlias, Any, ByteString, Union
+from typing import Tuple, Callable, List, Dict, Any, ByteString, Union
+from typing_extensions import TypeAlias
 
 from xpra.net.compression import Compressed, Compressible, LargeStructure
 from xpra.util import repr_ellipsized, envint, envbool

xpra/notifications/common.py

@@ -5,7 +5,8 @@
 
 import os.path
 from io import BytesIO
-from typing import Tuple, Optional, TypeAlias
+from typing import Tuple, Optional
+from typing_extensions import TypeAlias
 
 from xpra.util import first_time
 from xpra.os_util import load_binary_file

xpra/server/source/client_connection.py

@@ -7,7 +7,8 @@
 # later version. See the file COPYING for details.
 
 import sys
-from typing import Dict, Any, Optional, Tuple, Callable, Union, TypeAlias, List
+from typing import Dict, Any, Optional, Tuple, Callable, Union, List
+from typing_extensions import TypeAlias
 from time import sleep, monotonic
 from threading import Event
 from collections import deque