Modernize code

src/mboximporterinfogui.h

@@ -29,7 +29,7 @@ public:
     QWidget *parent() const override;
 
 private:
-    MBoxImportWidget *mParent = nullptr;
+    MBoxImportWidget *const mParent;
 };
 
 #endif /* MBOXIMPORTERINFOGUI_H */

src/mboximportwidget.h

@@ -41,7 +41,7 @@ Q_SIGNALS:
     void importMailsClicked();
 
 private:
-    Ui::MBoxImportWidget *ui = nullptr;
+    Ui::MBoxImportWidget *const ui;
 };
 
 #endif // MBOXIMPORTWIDGET_H

src/mboxmainwindow.h

@@ -21,7 +21,7 @@ private Q_SLOTS:
     void slotImportMBox();
 
 private:
-    QString mFileName;
+    const QString mFileName;
     MBoxImportWidget *mImportWidget = nullptr;
 };