De-duplicate the m.room.encryption event

include/timeline/TimelineView.h

@@ -165,7 +165,7 @@ protected:
 private:
         using TimelineEvent = mtx::events::collections::TimelineEvents;
 
-        QWidget *relativeWidget(TimelineItem *item, int dt) const;
+        QWidget *relativeWidget(QWidget *item, int dt) const;
 
         DecryptionResult parseEncryptedEvent(
           const mtx::events::EncryptedEvent<mtx::events::msg::Encrypted> &e);
@@ -265,6 +265,9 @@ private:
         QWidget *parseMessageEvent(const mtx::events::collections::TimelineEvents &event,
                                    TimelineDirection direction);
 
+        //! Store the event id associated with the given widget.
+        void saveEventId(QWidget *widget);
+
         QVBoxLayout *top_layout_;
         QVBoxLayout *scroll_layout_;
 
@@ -313,7 +316,7 @@ private:
         void renderTopEvents(const std::vector<TimelineEvent> &events);
 
         // The events currently rendered. Used for duplicate detection.
-        QMap<QString, TimelineItem *> eventIds_;
+        QMap<QString, QWidget *> eventIds_;
         QQueue<PendingMessage> pending_msgs_;
         QList<PendingMessage> pending_sent_msgs_;
 };

src/timeline/TimelineView.cc

@@ -221,9 +221,15 @@ TimelineView::parseMessageEvent(const mtx::events::collections::TimelineEvents &
 
                 return nullptr;
         } else if (mpark::holds_alternative<StateEvent<state::Encryption>>(event)) {
-                auto msg  = mpark::get<StateEvent<state::Encryption>>(event);
+                auto msg      = mpark::get<StateEvent<state::Encryption>>(event);
+                auto event_id = QString::fromStdString(msg.event_id);
+
+                if (eventIds_.contains(event_id))
+                        return nullptr;
+
                 auto item = new InfoMessage(tr("Encryption is enabled"), this);
                 item->saveDatetime(QDateTime::fromMSecsSinceEpoch(msg.origin_server_ts));
+                eventIds_[event_id] = item;
 
                 return item;
         } else if (mpark::holds_alternative<RoomEvent<msg::Audio>>(event)) {
@@ -993,7 +999,7 @@ TimelineView::removeEvent(const QString &event_id)
 }
 
 QWidget *
-TimelineView::relativeWidget(TimelineItem *item, int dt) const
+TimelineView::relativeWidget(QWidget *item, int dt) const
 {
         int pos = scroll_layout_->indexOf(item);