Some bug fixes and enhancements

mainwindow.h

@@ -3,6 +3,8 @@
 
 #include <QMainWindow>
 #include <QJsonObject>
+#include <memory>
+#include <QNetworkReply>
 
 QT_BEGIN_NAMESPACE
 namespace Ui { class MainWindow; }
@@ -11,6 +13,7 @@ QT_END_NAMESPACE
 class QTreeWidgetItem;
 class QFile;
 class QNetworkReply;
+class QAuthenticator;
 
 class MainWindow : public QMainWindow
 {
@@ -40,8 +43,8 @@ private slots:
     void on_autoTranslateButton_clicked();
     void on_searchButton_clicked();
     void on_searchNextButton_clicked();
-
     void on_deeplApiKey_editingFinished();
+    void on_copyButton_clicked();
 
 private:
     struct TranslationItem {
@@ -55,6 +58,7 @@ private:
         QString oldText;
         QString newText;
     };
+    std::unique_ptr<QNetworkAccessManager> networkManager;
     Ui::MainWindow *ui;
     QJsonObject configuration;
     bool noConfigChange{false};
@@ -72,6 +76,7 @@ private:
     void loadDeeplTranslationPossibilities();
     void renderDeeplSources();
     void translationRequestFinished(QNetworkReply *reply);
+    void onDeeplTranslationAuthenticationError(QNetworkReply *reply, QAuthenticator *authenticator);
     void countAndShowUntranslated();
     void searchNext();
     QVector<TranslationItem> parseTextBlock(const QString &block);