matrixion/src/timeline/TimelineViewManager.cpp

// SPDX-FileCopyrightText: 2021 Nheko Contributors
//
// SPDX-License-Identifier: GPL-3.0-or-later

#include "TimelineViewManager.h"

#include <QDropEvent>
#include <QMetaType>
#include <QPalette>
#include <QQmlContext>
#include <QQmlEngine>
#include <QString>

#include "BlurhashProvider.h"
#include "ChatPage.h"
#include "Clipboard.h"
#include "ColorImageProvider.h"
#include "CompletionProxyModel.h"
#include "DelegateChooser.h"
#include "DeviceVerificationFlow.h"
#include "EventAccessors.h"
#include "ImagePackModel.h"
#include "InviteesModel.h"
#include "Logging.h"
#include "MainWindow.h"
#include "MatrixClient.h"
#include "MxcImageProvider.h"
#include "RoomsModel.h"
#include "UserSettingsPage.h"
#include "UsersModel.h"
#include "dialogs/ImageOverlay.h"
#include "emoji/EmojiModel.h"
#include "emoji/Provider.h"
#include "ui/NhekoCursorShape.h"
#include "ui/NhekoDropArea.h"
#include "ui/NhekoGlobalObject.h"

Q_DECLARE_METATYPE(mtx::events::collections::TimelineEvents)
Q_DECLARE_METATYPE(std::vector<DeviceInfo>)

namespace msgs = mtx::events::msg;

namespace {
template<template<class...> class Op, class... Args>
using is_detected = typename nheko::detail::detector<nheko::nonesuch, void, Op, Args...>::value_t;

template<class Content>
using file_t = decltype(Content::file);

template<class Content>
using url_t = decltype(Content::url);

template<class Content>
using body_t = decltype(Content::body);

template<class Content>
using formatted_body_t = decltype(Content::formatted_body);

template<typename T>
static constexpr bool
messageWithFileAndUrl(const mtx::events::Event<T> &)
{
        return is_detected<file_t, T>::value && is_detected<url_t, T>::value;
}

template<typename T>
static constexpr void
removeReplyFallback(mtx::events::Event<T> &e)
{
        if constexpr (is_detected<body_t, T>::value) {
                if constexpr (std::is_same_v<std::optional<std::string>,
                                             std::remove_cv_t<decltype(e.content.body)>>) {
                        if (e.content.body) {
                                e.content.body = utils::stripReplyFromBody(e.content.body);
                        }
                } else if constexpr (std::is_same_v<std::string,
                                                    std::remove_cv_t<decltype(e.content.body)>>) {
                        e.content.body = utils::stripReplyFromBody(e.content.body);
                }
        }

        if constexpr (is_detected<formatted_body_t, T>::value) {
                if (e.content.format == "org.matrix.custom.html") {
                        e.content.formatted_body =
                          utils::stripReplyFromFormattedBody(e.content.formatted_body);
                }
        }
}
}

void
TimelineViewManager::updateColorPalette()
{
        userColors.clear();

        if (ChatPage::instance()->userSettings()->theme() == "light") {
                view->rootContext()->setContextProperty("currentActivePalette", QPalette());
                view->rootContext()->setContextProperty("currentInactivePalette", QPalette());
        } else if (ChatPage::instance()->userSettings()->theme() == "dark") {
                view->rootContext()->setContextProperty("currentActivePalette", QPalette());
                view->rootContext()->setContextProperty("currentInactivePalette", QPalette());
        } else {
                view->rootContext()->setContextProperty("currentActivePalette", QPalette());
                view->rootContext()->setContextProperty("currentInactivePalette", nullptr);
        }
}

QColor
TimelineViewManager::userColor(QString id, QColor background)
{
        if (!userColors.contains(id))
                userColors.insert(id, QColor(utils::generateContrastingHexColor(id, background)));
        return userColors.value(id);
}

QString
TimelineViewManager::userPresence(QString id) const
{
        if (id.isEmpty())
                return "";
        else
                return QString::fromStdString(
                  mtx::presence::to_string(cache::presenceState(id.toStdString())));
}

QString
TimelineViewManager::userStatus(QString id) const
{
        return QString::fromStdString(cache::statusMessage(id.toStdString()));
}

TimelineViewManager::TimelineViewManager(CallManager *callManager, ChatPage *parent)
  : QObject(parent)
  , imgProvider(new MxcImageProvider())
  , colorImgProvider(new ColorImageProvider())
  , blurhashProvider(new BlurhashProvider())
  , callManager_(callManager)
  , rooms_(new RoomlistModel(this))
  , communities_(new CommunitiesModel(this))
{
        qRegisterMetaType<mtx::events::msg::KeyVerificationAccept>();
        qRegisterMetaType<mtx::events::msg::KeyVerificationCancel>();
        qRegisterMetaType<mtx::events::msg::KeyVerificationDone>();
        qRegisterMetaType<mtx::events::msg::KeyVerificationKey>();
        qRegisterMetaType<mtx::events::msg::KeyVerificationMac>();
        qRegisterMetaType<mtx::events::msg::KeyVerificationReady>();
        qRegisterMetaType<mtx::events::msg::KeyVerificationRequest>();
        qRegisterMetaType<mtx::events::msg::KeyVerificationStart>();
        qRegisterMetaType<ImagePackModel *>();

        qmlRegisterUncreatableMetaObject(qml_mtx_events::staticMetaObject,
                                         "im.nheko",
                                         1,
                                         0,
                                         "MtxEvent",
                                         "Can't instantiate enum!");
        qmlRegisterUncreatableMetaObject(
          crypto::staticMetaObject, "im.nheko", 1, 0, "Crypto", "Can't instantiate enum!");
        qmlRegisterUncreatableMetaObject(verification::staticMetaObject,
                                         "im.nheko",
                                         1,
                                         0,
                                         "VerificationStatus",
                                         "Can't instantiate enum!");

        qmlRegisterType<DelegateChoice>("im.nheko", 1, 0, "DelegateChoice");
        qmlRegisterType<DelegateChooser>("im.nheko", 1, 0, "DelegateChooser");
        qmlRegisterType<NhekoDropArea>("im.nheko", 1, 0, "NhekoDropArea");
        qmlRegisterType<NhekoCursorShape>("im.nheko", 1, 0, "CursorShape");
        qmlRegisterUncreatableType<DeviceVerificationFlow>(
          "im.nheko", 1, 0, "DeviceVerificationFlow", "Can't create verification flow from QML!");
        qmlRegisterUncreatableType<UserProfile>(
          "im.nheko",
          1,
          0,
          "UserProfileModel",
          "UserProfile needs to be instantiated on the C++ side");
        qmlRegisterUncreatableType<MemberList>(
          "im.nheko", 1, 0, "MemberList", "MemberList needs to be instantiated on the C++ side");
        qmlRegisterUncreatableType<RoomSettings>(
          "im.nheko",
          1,
          0,
          "RoomSettingsModel",
          "Room Settings needs to be instantiated on the C++ side");
        qmlRegisterUncreatableType<TimelineModel>(
          "im.nheko", 1, 0, "Room", "Room needs to be instantiated on the C++ side");
        qmlRegisterUncreatableType<InviteesModel>(
          "im.nheko",
          1,
          0,
          "InviteesModel",
          "InviteesModel needs to be instantiated on the C++ side");

        static auto self = this;
        qmlRegisterSingletonType<MainWindow>(
          "im.nheko", 1, 0, "MainWindow", [](QQmlEngine *, QJSEngine *) -> QObject * {
                  auto ptr = MainWindow::instance();
                  QQmlEngine::setObjectOwnership(ptr, QQmlEngine::CppOwnership);
                  return ptr;
          });
        qmlRegisterSingletonType<TimelineViewManager>(
          "im.nheko", 1, 0, "TimelineManager", [](QQmlEngine *, QJSEngine *) -> QObject * {
                  auto ptr = self;
                  QQmlEngine::setObjectOwnership(ptr, QQmlEngine::CppOwnership);
                  return ptr;
          });
        qmlRegisterSingletonType<RoomlistModel>(
          "im.nheko", 1, 0, "Rooms", [](QQmlEngine *, QJSEngine *) -> QObject * {
                  auto ptr = new FilteredRoomlistModel(self->rooms_);

                  connect(self->communities_,
                          &CommunitiesModel::currentTagIdChanged,
                          ptr,
                          &FilteredRoomlistModel::updateFilterTag);
                  connect(self->communities_,
                          &CommunitiesModel::hiddenTagsChanged,
                          ptr,
                          &FilteredRoomlistModel::updateHiddenTagsAndSpaces);
                  return ptr;
          });
        qmlRegisterSingletonType<RoomlistModel>(
          "im.nheko", 1, 0, "Communities", [](QQmlEngine *, QJSEngine *) -> QObject * {
                  auto ptr = self->communities_;
                  QQmlEngine::setObjectOwnership(ptr, QQmlEngine::CppOwnership);
                  return ptr;
          });
        qmlRegisterSingletonType<UserSettings>(
          "im.nheko", 1, 0, "Settings", [](QQmlEngine *, QJSEngine *) -> QObject * {
                  auto ptr = ChatPage::instance()->userSettings().data();
                  QQmlEngine::setObjectOwnership(ptr, QQmlEngine::CppOwnership);
                  return ptr;
          });
        qmlRegisterSingletonType<CallManager>(
          "im.nheko", 1, 0, "CallManager", [](QQmlEngine *, QJSEngine *) -> QObject * {
                  auto ptr = ChatPage::instance()->callManager();
                  QQmlEngine::setObjectOwnership(ptr, QQmlEngine::CppOwnership);
                  return ptr;
          });
        qmlRegisterSingletonType<Clipboard>(
          "im.nheko", 1, 0, "Clipboard", [](QQmlEngine *, QJSEngine *) -> QObject * {
                  return new Clipboard();
          });
        qmlRegisterSingletonType<Nheko>(
          "im.nheko", 1, 0, "Nheko", [](QQmlEngine *, QJSEngine *) -> QObject * {
                  return new Nheko();
          });

        qRegisterMetaType<mtx::events::collections::TimelineEvents>();
        qRegisterMetaType<std::vector<DeviceInfo>>();

        qmlRegisterType<emoji::EmojiModel>("im.nheko.EmojiModel", 1, 0, "EmojiModel");
        qmlRegisterUncreatableType<emoji::Emoji>(
          "im.nheko.EmojiModel", 1, 0, "Emoji", "Used by emoji models");
        qmlRegisterUncreatableMetaObject(emoji::staticMetaObject,
                                         "im.nheko.EmojiModel",
                                         1,
                                         0,
                                         "EmojiCategory",
                                         "Error: Only enums");

#ifdef USE_QUICK_VIEW
        view      = new QQuickView(parent);
        container = QWidget::createWindowContainer(view, parent);
#else
        view      = new QQuickWidget(parent);
        container = view;
        view->setResizeMode(QQuickWidget::SizeRootObjectToView);
        container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);

        connect(view, &QQuickWidget::statusChanged, this, [](QQuickWidget::Status status) {
                nhlog::ui()->debug("Status changed to {}", status);
        });
#endif
        container->setMinimumSize(200, 200);
        updateColorPalette();
        view->engine()->addImageProvider("MxcImage", imgProvider);
        view->engine()->addImageProvider("colorimage", colorImgProvider);
        view->engine()->addImageProvider("blurhash", blurhashProvider);
        view->setSource(QUrl("qrc:///qml/Root.qml"));

        connect(parent, &ChatPage::themeChanged, this, &TimelineViewManager::updateColorPalette);
        connect(
          dynamic_cast<ChatPage *>(parent),
          &ChatPage::receivedRoomDeviceVerificationRequest,
          this,
          [this](const mtx::events::RoomEvent<mtx::events::msg::KeyVerificationRequest> &message,
                 TimelineModel *model) {
                  if (this->isInitialSync_)
                          return;

                  auto event_id = QString::fromStdString(message.event_id);
                  if (!this->dvList.contains(event_id)) {
                          if (auto flow = DeviceVerificationFlow::NewInRoomVerification(
                                this,
                                model,
                                message.content,
                                QString::fromStdString(message.sender),
                                event_id)) {
                                  dvList[event_id] = flow;
                                  emit newDeviceVerificationRequest(flow.data());
                          }
                  }
          });
        connect(dynamic_cast<ChatPage *>(parent),
                &ChatPage::receivedDeviceVerificationRequest,
                this,
                [this](const mtx::events::msg::KeyVerificationRequest &msg, std::string sender) {
                        if (this->isInitialSync_)
                                return;

                        if (!msg.transaction_id)
                                return;

                        auto txnid = QString::fromStdString(msg.transaction_id.value());
                        if (!this->dvList.contains(txnid)) {
                                if (auto flow = DeviceVerificationFlow::NewToDeviceVerification(
                                      this, msg, QString::fromStdString(sender), txnid)) {
                                        dvList[txnid] = flow;
                                        emit newDeviceVerificationRequest(flow.data());
                                }
                        }
                });
        connect(dynamic_cast<ChatPage *>(parent),
                &ChatPage::receivedDeviceVerificationStart,
                this,
                [this](const mtx::events::msg::KeyVerificationStart &msg, std::string sender) {
                        if (this->isInitialSync_)
                                return;

                        if (!msg.transaction_id)
                                return;

                        auto txnid = QString::fromStdString(msg.transaction_id.value());
                        if (!this->dvList.contains(txnid)) {
                                if (auto flow = DeviceVerificationFlow::NewToDeviceVerification(
                                      this, msg, QString::fromStdString(sender), txnid)) {
                                        dvList[txnid] = flow;
                                        emit newDeviceVerificationRequest(flow.data());
                                }
                        }
                });
        connect(parent, &ChatPage::loggedOut, this, [this]() {
                isInitialSync_ = true;
                emit initialSyncChanged(true);
        });

        connect(this,
                &TimelineViewManager::openImageOverlayInternalCb,
                this,
                &TimelineViewManager::openImageOverlayInternal);
}

void
TimelineViewManager::openRoomMembers(QString room_id)
{
        MemberList *memberList = new MemberList(room_id, this);
        emit openRoomMembersDialog(memberList);
}

void
TimelineViewManager::openRoomSettings(QString room_id)
{
        RoomSettings *settings = new RoomSettings(room_id, this);
        connect(rooms_->getRoomById(room_id).data(),
                &TimelineModel::roomAvatarUrlChanged,
                settings,
                &RoomSettings::avatarChanged);
        emit openRoomSettingsDialog(settings);
}

void
TimelineViewManager::openInviteUsers(QString roomId)
{
        InviteesModel *model = new InviteesModel{this};
        connect(model, &InviteesModel::accept, this, [this, model, roomId]() {
                emit inviteUsers(roomId, model->mxids());
        });
        emit openInviteUsersDialog(model);
}

void
TimelineViewManager::setVideoCallItem()
{
        WebRTCSession::instance().setVideoItem(
          view->rootObject()->findChild<QQuickItem *>("videoCallItem"));
}

void
TimelineViewManager::sync(const mtx::responses::Rooms &rooms_res)
{
        this->rooms_->sync(rooms_res);
        this->communities_->sync(rooms_res);

        if (isInitialSync_) {
                this->isInitialSync_ = false;
                emit initialSyncChanged(false);
        }
}

void
TimelineViewManager::showEvent(const QString &room_id, const QString &event_id)
{
        if (auto room = rooms_->getRoomById(room_id)) {
                if (rooms_->currentRoom() != room) {
                        rooms_->setCurrentRoom(room_id);
                        container->setFocus();
                        nhlog::ui()->info("Activated room {}", room_id.toStdString());
                }

                room->showEvent(event_id);
        }
}

QString
TimelineViewManager::escapeEmoji(QString str) const
{
        return utils::replaceEmoji(str);
}

void
TimelineViewManager::openImageOverlay(QString mxcUrl, QString eventId)
{
        if (mxcUrl.isEmpty()) {
                return;
        }

        MxcImageProvider::download(
          mxcUrl.remove("mxc://"), QSize(), [this, eventId](QString, QSize, QImage img, QString) {
                  if (img.isNull()) {
                          nhlog::ui()->error("Error when retrieving image for overlay.");
                          return;
                  }

                  emit openImageOverlayInternalCb(eventId, std::move(img));
          });
}

void
TimelineViewManager::openImageOverlayInternal(QString eventId, QImage img)
{
        auto pixmap = QPixmap::fromImage(img);

        auto imgDialog = new dialogs::ImageOverlay(pixmap);
        imgDialog->showFullScreen();

        auto room = rooms_->currentRoom();
        connect(imgDialog, &dialogs::ImageOverlay::saving, room, [eventId, imgDialog, room]() {
                // hide the overlay while presenting the save dialog for better
                // cross platform support.
                imgDialog->hide();

                if (!room->saveMedia(eventId)) {
                        imgDialog->show();
                } else {
                        imgDialog->close();
                }
        });
}

void
TimelineViewManager::openLeaveRoomDialog(QString roomid) const
{
        MainWindow::instance()->openLeaveRoomDialog(roomid);
}

void
TimelineViewManager::verifyUser(QString userid)
{
        auto joined_rooms = cache::joinedRooms();
        auto room_infos   = cache::getRoomInfo(joined_rooms);

        for (std::string room_id : joined_rooms) {
                if ((room_infos[QString::fromStdString(room_id)].member_count == 2) &&
                    cache::isRoomEncrypted(room_id)) {
                        auto room_members = cache::roomMembers(room_id);
                        if (std::find(room_members.begin(),
                                      room_members.end(),
                                      (userid).toStdString()) != room_members.end()) {
                                if (auto model =
                                      rooms_->getRoomById(QString::fromStdString(room_id))) {
                                        auto flow =
                                          DeviceVerificationFlow::InitiateUserVerification(
                                            this, model.data(), userid);
                                        connect(model.data(),
                                                &TimelineModel::updateFlowEventId,
                                                this,
                                                [this, flow](std::string eventId) {
                                                        dvList[QString::fromStdString(eventId)] =
                                                          flow;
                                                });
                                        emit newDeviceVerificationRequest(flow.data());
                                        return;
                                }
                        }
                }
        }

        emit ChatPage::instance()->showNotification(
          tr("No encrypted private chat found with this user. Create an "
             "encrypted private chat with this user and try again."));
}

void
TimelineViewManager::removeVerificationFlow(DeviceVerificationFlow *flow)
{
        for (auto it = dvList.keyValueBegin(); it != dvList.keyValueEnd(); ++it) {
                if ((*it).second == flow) {
                        dvList.remove((*it).first);
                        return;
                }
        }
}

void
TimelineViewManager::verifyDevice(QString userid, QString deviceid)
{
        auto flow = DeviceVerificationFlow::InitiateDeviceVerification(this, userid, deviceid);
        this->dvList[flow->transactionId()] = flow;
        emit newDeviceVerificationRequest(flow.data());
}

void
TimelineViewManager::updateReadReceipts(const QString &room_id,
                                        const std::vector<QString> &event_ids)
{
        if (auto room = rooms_->getRoomById(room_id)) {
                room->markEventsAsRead(event_ids);
        }
}

void
TimelineViewManager::receivedSessionKey(const std::string &room_id, const std::string &session_id)
{
        if (auto room = rooms_->getRoomById(QString::fromStdString(room_id))) {
                room->receivedSessionKey(session_id);
        }
}

void
TimelineViewManager::initializeRoomlist()
{
        rooms_->initializeRooms();
        communities_->initializeSidebar();
}

void
TimelineViewManager::queueReply(const QString &roomid,
                                const QString &repliedToEvent,
                                const QString &replyBody)
{
        if (auto room = rooms_->getRoomById(roomid)) {
                room->setReply(repliedToEvent);
                room->input()->message(replyBody);
        }
}

void
TimelineViewManager::queueCallMessage(const QString &roomid,
                                      const mtx::events::msg::CallInvite &callInvite)
{
        if (auto room = rooms_->getRoomById(roomid))
                room->sendMessageEvent(callInvite, mtx::events::EventType::CallInvite);
}

void
TimelineViewManager::queueCallMessage(const QString &roomid,
                                      const mtx::events::msg::CallCandidates &callCandidates)
{
        if (auto room = rooms_->getRoomById(roomid))
                room->sendMessageEvent(callCandidates, mtx::events::EventType::CallCandidates);
}

void
TimelineViewManager::queueCallMessage(const QString &roomid,
                                      const mtx::events::msg::CallAnswer &callAnswer)
{
        if (auto room = rooms_->getRoomById(roomid))
                room->sendMessageEvent(callAnswer, mtx::events::EventType::CallAnswer);
}

void
TimelineViewManager::queueCallMessage(const QString &roomid,
                                      const mtx::events::msg::CallHangUp &callHangUp)
{
        if (auto room = rooms_->getRoomById(roomid))
                room->sendMessageEvent(callHangUp, mtx::events::EventType::CallHangUp);
}

void
TimelineViewManager::focusMessageInput()
{
        emit focusInput();
}

QObject *
TimelineViewManager::completerFor(QString completerName, QString roomId)
{
        if (completerName == "user") {
                auto userModel = new UsersModel(roomId.toStdString());
                auto proxy     = new CompletionProxyModel(userModel);
                userModel->setParent(proxy);
                return proxy;
        } else if (completerName == "emoji") {
                auto emojiModel = new emoji::EmojiModel();
                auto proxy      = new CompletionProxyModel(emojiModel);
                emojiModel->setParent(proxy);
                return proxy;
        } else if (completerName == "allemoji") {
                auto emojiModel = new emoji::EmojiModel();
                auto proxy = new CompletionProxyModel(emojiModel, 1, static_cast<size_t>(-1) / 4);
                emojiModel->setParent(proxy);
                return proxy;
        } else if (completerName == "room") {
                auto roomModel = new RoomsModel(false);
                auto proxy     = new CompletionProxyModel(roomModel, 4);
                roomModel->setParent(proxy);
                return proxy;
        } else if (completerName == "roomAliases") {
                auto roomModel = new RoomsModel(true);
                auto proxy     = new CompletionProxyModel(roomModel);
                roomModel->setParent(proxy);
                return proxy;
        } else if (completerName == "stickers") {
                auto stickerModel = new ImagePackModel(roomId.toStdString(), true);
                auto proxy = new CompletionProxyModel(stickerModel, 1, static_cast<size_t>(-1) / 4);
                stickerModel->setParent(proxy);
                return proxy;
        }
        return nullptr;
}

void
TimelineViewManager::focusTimeline()
{
        getWidget()->setFocus();
}

void
TimelineViewManager::forwardMessageToRoom(mtx::events::collections::TimelineEvents *e,
                                          QString roomId)
{
        auto room                                                = rooms_->getRoomById(roomId);
        auto content                                             = mtx::accessors::url(*e);
        std::optional<mtx::crypto::EncryptedFile> encryptionInfo = mtx::accessors::file(*e);

        if (encryptionInfo) {
                http::client()->download(
                  content,
                  [this, roomId, e, encryptionInfo](const std::string &res,
                                                    const std::string &content_type,
                                                    const std::string &originalFilename,
                                                    mtx::http::RequestErr err) {
                          if (err)
                                  return;

                          auto data = mtx::crypto::to_string(
                            mtx::crypto::decrypt_file(res, encryptionInfo.value()));

                          http::client()->upload(
                            data,
                            content_type,
                            originalFilename,
                            [this, roomId, e](const mtx::responses::ContentURI &res,
                                              mtx::http::RequestErr err) mutable {
                                    if (err) {
                                            nhlog::net()->warn("failed to upload media: {} {} ({})",
                                                               err->matrix_error.error,
                                                               to_string(err->matrix_error.errcode),
                                                               static_cast<int>(err->status_code));
                                            return;
                                    }

                                    std::visit(
                                      [this, roomId, url = res.content_uri](auto ev) {
                                              if constexpr (mtx::events::message_content_to_type<
                                                              decltype(ev.content)> ==
                                                            mtx::events::EventType::RoomMessage) {
                                                      if constexpr (messageWithFileAndUrl(ev)) {
                                                              ev.content.relations.relations
                                                                .clear();
                                                              ev.content.file.reset();
                                                              ev.content.url = url;
                                                      }

                                                      if (auto room = rooms_->getRoomById(roomId)) {
                                                              removeReplyFallback(ev);
                                                              ev.content.relations.relations
                                                                .clear();
                                                              room->sendMessageEvent(
                                                                ev.content,
                                                                mtx::events::EventType::
                                                                  RoomMessage);
                                                      }
                                              }
                                      },
                                      *e);
                            });

                          return;
                  });

                return;
        }

        std::visit(
          [room](auto e) {
                  if constexpr (mtx::events::message_content_to_type<decltype(e.content)> ==
                                mtx::events::EventType::RoomMessage) {
                          e.content.relations.relations.clear();
                          removeReplyFallback(e);
                          room->sendMessageEvent(e.content, mtx::events::EventType::RoomMessage);
                  }
          },
          *e);
}

//! WORKAROUND(Nico): for https://bugreports.qt.io/browse/QTBUG-93281
void
TimelineViewManager::fixImageRendering(QQuickTextDocument *t, QQuickItem *i)
{
        if (t) {
                QObject::connect(
                  t->textDocument(), SIGNAL(imagesLoaded()), i, SLOT(updateWholeDocument()));
        }
}