Avoid UI updates in Chat selection screen when forwarding a chat, by cloning the chat list model.

src/chatlistmodel.cpp

@@ -91,6 +91,7 @@ public:
     QVector<int> updateLastMessage(const QVariantMap &message);
     QVector<int> updateGroup(const TDLibWrapper::Group *group);
     QVector<int> updateSecretChat(const QVariantMap &secretChatDetails);
+    ChatData* clone();
     TDLibWrapper *tdLibWrapper;
 
 public:
@@ -384,6 +385,24 @@ QVector<int> ChatListModel::ChatData::updateSecretChat(const QVariantMap &secret
     return changedRoles;
 }
 
+ChatListModel::ChatData* ChatListModel::ChatData::clone() {
+    QVariantMap clonedChatData;
+
+    QList<QString> keys = chatData.keys();
+    for(int i = 0; i < keys.count(); i++) {
+        clonedChatData.insert(keys[i], QVariant(chatData[keys[i]]));
+    }
+    ChatData* res = new ChatData(tdLibWrapper, clonedChatData);
+    res->chatId = chatId;
+    res->order = order;
+    res->groupId = groupId;
+    res->verified = verified;
+    res->chatType = chatType;
+    res->memberStatus = memberStatus;
+    res->secretChatState = secretChatState;
+    return res;
+}
+
 ChatListModel::ChatListModel(TDLibWrapper *tdLibWrapper, AppSettings *appSettings) : showHiddenChats(false)
 {
     this->tdLibWrapper = tdLibWrapper;
@@ -426,6 +445,15 @@ ChatListModel::~ChatListModel()
     qDeleteAll(hiddenChats.values());
 }
 
+ChatListModel* ChatListModel::clone() {
+    ChatListModel* res = new ChatListModel(tdLibWrapper, appSettings);
+    res->relativeTimeRefreshTimer->stop();
+    for(int i = 0; i < chatList.count(); i++) {
+        res->chatList.append(chatList.at(i)->clone());
+    }
+    return res;
+}
+
 void ChatListModel::reset()
 {
     chatList.clear();

src/chatlistmodel.h

@@ -75,6 +75,7 @@ public:
 
     bool showAllChats() const;
     void setShowAllChats(bool showAll);
+    ChatListModel* clone();
 
 private slots:
     void handleChatDiscovered(const QString &chatId, const QVariantMap &chatInformation);

src/chatpermissionfiltermodel.cpp

@@ -33,7 +33,9 @@ ChatPermissionFilterModel::ChatPermissionFilterModel(QObject *parent) : QSortFil
 
 void ChatPermissionFilterModel::setSource(QObject *model)
 {
-    setSourceModel(qobject_cast<ChatListModel*>(model));
+    ChatListModel* chatListModel = qobject_cast<ChatListModel*>(model);
+    ChatListModel* chatListModelClone = chatListModel->clone();
+    setSourceModel(chatListModelClone);
 }
 
 void ChatPermissionFilterModel::setSourceModel(QAbstractItemModel *model)
@@ -45,6 +47,13 @@ void ChatPermissionFilterModel::setSourceModel(QAbstractItemModel *model)
     }
 }
 
+ChatPermissionFilterModel::~ChatPermissionFilterModel() {
+    QAbstractItemModel* _sourceModel = sourceModel();
+    if(_sourceModel != nullptr) {
+        delete _sourceModel;
+    }
+}
+
 TDLibWrapper *ChatPermissionFilterModel::getTDLibWrapper() const
 {
     return tdLibWrapper;

src/chatpermissionfiltermodel.h

@@ -31,7 +31,7 @@ class ChatPermissionFilterModel : public QSortFilterProxyModel
 
 public:
     ChatPermissionFilterModel(QObject *parent = Q_NULLPTR);
-
+    ~ChatPermissionFilterModel() override;
     TDLibWrapper *getTDLibWrapper() const;
     void setTDLibWrapper(QObject* obj);