Aggregate similar state events

src/neochatroom.cpp

@@ -396,6 +396,18 @@ QString NeoChatRoom::eventToString(const RoomEvent &evt, Qt::TextFormat format,
         [this](const RoomMemberEvent &e) {
             // FIXME: Rewind to the name that was at the time of this event
             auto subjectName = this->htmlSafeMemberName(e.userId());
+            if (e.membership() == MembershipType::Leave) {
+                auto displayName = e.prevContent()->displayName;
+#ifdef QUOTIENT_07
+                if (displayName) {
+                    subjectName = sanitized(*displayName).toHtmlEscaped();
+#else
+                if (displayName.isEmpty()) {
+                    subjectName = sanitized(displayName).toHtmlEscaped();
+#endif
+                }
+            }
+
             // The below code assumes senderName output in AuthorRole
             switch (e.membership()) {
             case MembershipType::Invite: