Fix deleting megolm sessions on device removal

Author: tulir

CHANGELOG.md

@@ -1,3 +1,7 @@
+## v0.19.13 (2023-04-24)
+
+* *(crypto)* Fixed bug with redacting megolm sessions when device is deleted.
+
 ## v0.19.12 (2023-04-18)
 
 * *(bridge)* Fixed backwards-compatibility with new key deletion config options.

mautrix/__init__.py

@@ -1,4 +1,4 @@
-__version__ = "0.19.12"
+__version__ = "0.19.13"
 __author__ = "Tulir Asokan <[email protected]>"
 __all__ = [
     "api",

mautrix/crypto/device_lists.py

@@ -82,7 +82,7 @@ async def _fetch_keys(
 
             if changed or len(new_devices) != len(existing_devices):
                 if self.delete_keys_on_device_delete:
-                    for device_id in new_devices.keys() - existing_devices.keys():
+                    for device_id in existing_devices.keys() - new_devices.keys():
                         device = existing_devices[device_id]
                         removed_ids = await self.crypto_store.redact_group_sessions(
                             room_id=None, sender_key=device.identity_key, reason="device removed"