[fractal] member: Update member from event with state key instead of sender

[Kévin Commaille <kcommaille src gnome org>]

commit 11f7abd1ae2b5bc3e61b008a48512c55ac2c9491
Author: Kévin Commaille <zecakeh tedomum fr>
Date:   Sat Apr 23 12:04:08 2022 +0200

    member: Update member from event with state key instead of sender

 src/session/room/member_list.rs | 5 +++--
 src/session/room/mod.rs         | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/session/room/member_list.rs b/src/session/room/member_list.rs
index e37c93174..63f237c4b 100644
--- a/src/session/room/member_list.rs
+++ b/src/session/room/member_list.rs
@@ -155,8 +155,9 @@ impl MemberList {
     /// Creates a new member first if there is no member matching the given
     /// event.
     pub fn update_member_for_member_event(&self, event: &SyncStateEvent<RoomMemberEventContent>) {
-        self.member_by_id(event.sender.clone().into())
-            .update_from_member_event(event);
+        if let Ok(user_id) = UserId::parse_arc(event.state_key.as_str()) {
+            self.member_by_id(user_id).update_from_member_event(event);
+        }
     }
 
     /// Returns whether the given user id is present in `MemberList`
diff --git a/src/session/room/mod.rs b/src/session/room/mod.rs
index fe8f30953..c13f59f57 100644
--- a/src/session/room/mod.rs
+++ b/src/session/room/mod.rs
@@ -1023,7 +1023,7 @@ impl Room {
 
         let inviter_event = events.iter().find(|event| {
             if let AnyStrippedStateEvent::RoomMember(event) = event {
-                event.sender == inviter_id
+                event.state_key == inviter_id.as_str()
             } else {
                 false
             }