Qt6 port:

* Explicitly include some missing headers
* Use 'static const char*' for XPM icon
* Skip template parameters for qMakePair
* Constructor of QFileInfo is marked as 'explicit' now
* QString::fromLatin1() also accepts a QByteArray
* QDateTime::fromTime_t() is deprecated in Qt5 and has been removed in Qt6. Use QDateTime::fromSecsSinceEpoch()
* QDateTime::toTime_t() is deprecated in Qt5 and has been removed in Qt6. Use QDateTime::toSecsSinceEpoch()
* QApplication::globalStrut() is deprecated. Don't use it any more.
* QWidget::isTopLevel() is deprecated, use QWidget::isWindow()

src/Gui/DocumentRecovery.cpp

@@ -331,7 +331,7 @@ void DocumentRecovery::accept()
                             << docs[i]->Label.getValue() << "'");
                 }
                 else {
-                    DocumentRecoveryCleaner().clearDirectory(xfi.absolutePath());
+                    DocumentRecoveryCleaner().clearDirectory(QFileInfo(xfi.absolutePath()));
                     QDir().rmdir(xfi.absolutePath());
                 }