Following the spec more precisely

Author: multisme

crates/matrix-sdk-base/src/room/members.rs

@@ -217,7 +217,8 @@ impl RoomMember {
         let display_name = event.display_name();
         let membership = event.membership();
         let display_name_ambiguous = users_display_names.get(&display_name).is_some_and(|s| {
-            is_display_name_ambiguous(&display_name, s) && *membership != MembershipState::Leave
+            is_display_name_ambiguous(&display_name, s)
+                && (*membership == MembershipState::Join || *membership == MembershipState::Invite)
         });
         let is_ignored = ignored_users.as_ref().is_some_and(|s| s.contains(event.user_id()));