Rename initialize to sync, since it does the same thing

src/ChatPage.cpp

@@ -566,7 +566,7 @@ ChatPage::ChatPage(QSharedPointer<UserSettings> userSettings, QWidget *parent)
         connect(this,
                 &ChatPage::initializeViews,
                 view_manager_,
-                [this](const mtx::responses::Rooms &rooms) { view_manager_->initialize(rooms); });
+                [this](const mtx::responses::Rooms &rooms) { view_manager_->sync(rooms); });
         connect(this,
                 &ChatPage::initializeEmptyViews,
                 view_manager_,
@@ -582,7 +582,7 @@ ChatPage::ChatPage(QSharedPointer<UserSettings> userSettings, QWidget *parent)
                         nhlog::db()->error("failed to retrieve invites: {}", e.what());
                 }
 
-                view_manager_->initialize(rooms);
+                view_manager_->sync(rooms);
                 removeLeftRooms(rooms.leave);
 
                 bool hasNotifications = false;

src/timeline2/TimelineViewManager.cpp

@@ -27,9 +27,10 @@ TimelineViewManager::TimelineViewManager(QWidget *parent)
 }
 
 void
-TimelineViewManager::initialize(const mtx::responses::Rooms &rooms)
+TimelineViewManager::sync(const mtx::responses::Rooms &rooms)
 {
         for (auto it = rooms.join.cbegin(); it != rooms.join.cend(); ++it) {
+                // addRoom will only add the room, if it doesn't exist
                 addRoom(QString::fromStdString(it->first));
                 models.value(QString::fromStdString(it->first))->addEvents(it->second.timeline);
         }

src/timeline2/TimelineViewManager.h

@@ -28,10 +28,9 @@ public:
         TimelineViewManager(QWidget *parent = 0);
         QWidget *getWidget() const { return container; }
 
-        void initialize(const mtx::responses::Rooms &rooms);
+        void sync(const mtx::responses::Rooms &rooms);
         void addRoom(const QString &room_id);
 
-        void sync(const mtx::responses::Rooms &rooms) {}
         void clearAll() { models.clear(); }
 
         Q_INVOKABLE TimelineModel *activeTimeline() const { return timeline_; }