refactor: some mini feature changes in BaseWindow (#6074)

src/widgets/dialogs/UpdateDialog.cpp

@@ -15,6 +15,8 @@ UpdateDialog::UpdateDialog()
     : BaseWindow({BaseWindow::Frameless, BaseWindow::TopMost,
                   BaseWindow::EnableCustomFrame, BaseWindow::DisableLayoutSave})
 {
+    this->windowDeactivateAction = WindowDeactivateAction::Delete;
+
     auto layout =
         LayoutCreator<UpdateDialog>(this).setLayoutType<QVBoxLayout>();
 

src/widgets/dialogs/switcher/QuickSwitcherPopup.cpp

@@ -48,8 +48,9 @@ QuickSwitcherPopup::QuickSwitcherPopup(Window *parent)
     , switcherModel_(this)
     , window(parent)
 {
-    this->setWindowFlag(Qt::Dialog);
-    this->setActionOnFocusLoss(BaseWindow::ActionOnFocusLoss::Delete);
+    assert(this->windowFlags().testFlag(Qt::Dialog));
+
+    this->windowDeactivateAction = WindowDeactivateAction::Delete;
     this->setMinimumSize(QuickSwitcherPopup::MINIMUM_SIZE);
 
     this->initWidgets();