Revert "qtui: Account for Qt 6 sending close events at shutdown"

No longer needed now that the main window is destroyed before
QApplication::quit().

This reverts commit efacaab.

Author: jlindgren90

src/qtui/main_window.cc

@@ -223,27 +223,15 @@ MainWindow::MainWindow()
 }
 
 MainWindow::~MainWindow()
-{
-    // should have already been called in teardown(), but we'll
-    // make sure so that audqt isn't left with a dangling pointer
-    audqt::unregister_dock_host();
-
-    if (m_search_tool)
-        aud_plugin_remove_watch(m_search_tool, plugin_watcher, this);
-}
-
-// should be called before QApplication::quit() in
-// order to tear down the UI in an orderly fashion
-void MainWindow::teardown()
 {
     QSettings settings(m_config_name, "QtUi");
     settings.setValue("geometry", saveGeometry());
     settings.setValue("windowState", saveState());
 
-    // destroy plugin windows explicitly, otherwise Qt may send close
-    // events to them during QApplication shutdown, causing plugins to
-    // be disabled at next startup
     audqt::unregister_dock_host();
+
+    if (m_search_tool)
+        aud_plugin_remove_watch(m_search_tool, plugin_watcher, this);
 }
 
 void MainWindow::closeEvent(QCloseEvent * e)

src/qtui/main_window.h

@@ -41,8 +41,6 @@ class MainWindow : public QMainWindow, audqt::DockHost
     MainWindow();
     ~MainWindow();
 
-    void teardown();
-
 private:
     QString m_config_name;
     DialogWindows m_dialogs;

src/qtui/qtui.cc

@@ -75,7 +75,6 @@ class QtUI : public audqt::QtIfacePlugin
 
     void quit()
     {
-        window->teardown();
         window->deleteLater();
         window = nullptr;
     }