operator+/- is disabled for QFlags in qt6

src/platformtheme/kdirselectdialog.cpp

@@ -363,7 +363,7 @@ KDirSelectDialog::KDirSelectDialog(const QUrl &startDir, bool localOnly, QWidget
     d->deleteAction = new QAction(i18nc("@action:inmenu", "Delete"), this);
     d->m_actions->addAction(d->deleteAction->objectName(), d->deleteAction);
     d->deleteAction->setIcon(QIcon::fromTheme(QStringLiteral("edit-delete")));
-    d->deleteAction->setShortcut(Qt::SHIFT + Qt::Key_Delete);
+    d->deleteAction->setShortcut(Qt::SHIFT | Qt::Key_Delete);
     connect(d->deleteAction, SIGNAL(triggered(bool)), this, SLOT(slotDelete()));
     d->m_contextMenu->addAction(d->deleteAction);
 
@@ -379,7 +379,7 @@ KDirSelectDialog::KDirSelectDialog(const QUrl &startDir, bool localOnly, QWidget
     QAction *propertiesAction = new QAction(i18nc("@action:inmenu", "Properties"), this);
     d->m_actions->addAction(propertiesAction->objectName(), propertiesAction);
     propertiesAction->setIcon(QIcon::fromTheme(QStringLiteral("document-properties")));
-    propertiesAction->setShortcut(Qt::ALT + Qt::Key_Return);
+    propertiesAction->setShortcut(Qt::ALT | Qt::Key_Return);
     connect(propertiesAction, SIGNAL(triggered(bool)), this, SLOT(slotProperties()));
     d->m_contextMenu->addAction(propertiesAction);