backends/winrt/client: fix potential race condition for session status

We need to check the current session status *after* registering the
event handler, otherwise we might miss the event if the session
status changes between checking the status and registering the handler.

Fixes: #1829

Author: dlech

CHANGELOG.rst

@@ -10,6 +10,10 @@ and this project adheres to `Semantic Versioning <https://semver.org/spec/v2.0.0
 `Unreleased`_
 =============
 
+Fixed
+-----
+- Fixed potential race condition causing timeout while connecting in WinRT backend. Fixes #1829.
+
 `1.1.1`_ (2025-09-07)
 =====================
 

bleak/backends/winrt/client.py

@@ -360,20 +360,20 @@ def max_pdu_size_changed_handler(sender: GattSession, args: Object) -> None:
                 )
             )
 
-            # If the session is already active, we need to set the event since
-            # the session_status_changed event won't fire. This happens, e.g.,
-            # when pairing before connecting which causes the device to already
-            # be connected.
-            if self._session.session_status == GattSessionStatus.ACTIVE:
-                event.set()
-
             self._max_pdu_size_changed_token = self._session.add_max_pdu_size_changed(
                 max_pdu_size_changed_handler
             )
 
             services_changed_event = asyncio.Event()
             self._services_changed_events.append(services_changed_event)
 
+            # If the session is already active, we need to set the event since
+            # the session_status_changed event won't fire. This happens, e.g.,
+            # when pairing before connecting which causes the device to already
+            # be connected.
+            if self._session.session_status == GattSessionStatus.ACTIVE:
+                event.set()
+
             try:
                 # Windows does not support explicitly connecting to a device.
                 # Instead it has the concept of a GATT session that is owned