Fix use after free from Qml widget

src/ChatPage.cpp

@@ -171,6 +171,14 @@ ChatPage::ChatPage(QSharedPointer<UserSettings> userSettings, QWidget *parent)
                         activateWindow();
                 });
 
+        connect(QCoreApplication::instance(), &QCoreApplication::aboutToQuit, this, [this]() {
+                // ensure the qml context is shutdown before we destroy all other singletons
+                // Otherwise Qml will try to access the room list or settings, after they have been
+                // destroyed
+                topLayout_->removeWidget(view_manager_->getWidget());
+                delete view_manager_->getWidget();
+        });
+
         connect(
           this,
           &ChatPage::initializeViews,

src/timeline/RoomlistModel.cpp

@@ -13,7 +13,8 @@
 #include "UserSettingsPage.h"
 
 RoomlistModel::RoomlistModel(TimelineViewManager *parent)
-  : manager(parent)
+  : QAbstractListModel(parent)
+  , manager(parent)
 {
         connect(ChatPage::instance(), &ChatPage::decryptSidebarChanged, this, [this]() {
                 auto decrypt = ChatPage::instance()->userSettings()->decryptSidebar();

src/timeline/TimelineViewManager.cpp

@@ -129,7 +129,8 @@ TimelineViewManager::userStatus(QString id) const
 }
 
 TimelineViewManager::TimelineViewManager(CallManager *callManager, ChatPage *parent)
-  : imgProvider(new MxcImageProvider())
+  : QObject(parent)
+  , imgProvider(new MxcImageProvider())
   , colorImgProvider(new ColorImageProvider())
   , blurhashProvider(new BlurhashProvider())
   , callManager_(callManager)
@@ -230,7 +231,7 @@ TimelineViewManager::TimelineViewManager(CallManager *callManager, ChatPage *par
                                          "Error: Only enums");
 
 #ifdef USE_QUICK_VIEW
-        view      = new QQuickView();
+        view      = new QQuickView(parent);
         container = QWidget::createWindowContainer(view, parent);
 #else
         view      = new QQuickWidget(parent);