Qt: Fix display window geometry not saving

src/duckstation-qt/mainwindow.cpp

@@ -97,6 +97,7 @@ QtDisplayWidget* MainWindow::createDisplay(QThread* worker_thread, const QString
   }
   else if (!render_to_main)
   {
+    restoreDisplayWindowGeometryFromConfig();
     m_display_widget->showNormal();
   }
   else
@@ -149,6 +150,7 @@ QtDisplayWidget* MainWindow::updateDisplay(QThread* worker_thread, bool fullscre
   }
   else if (!render_to_main)
   {
+    restoreDisplayWindowGeometryFromConfig();
     m_display_widget->showNormal();
   }
   else
@@ -195,6 +197,10 @@ void MainWindow::destroyDisplayWidget()
     switchToGameListView();
     m_ui.mainContainer->removeWidget(m_display_widget);
   }
+  else if (!m_display_widget->isFullScreen())
+  {
+    saveDisplayWindowGeometryToConfig();
+  }
 
   delete m_display_widget;
   m_display_widget = nullptr;
@@ -943,6 +949,23 @@ void MainWindow::restoreStateFromConfig()
   }
 }
 
+void MainWindow::saveDisplayWindowGeometryToConfig()
+{
+  const QByteArray geometry = m_display_widget->saveGeometry();
+  const QByteArray geometry_b64 = geometry.toBase64();
+  const std::string old_geometry_b64 = m_host_interface->GetStringSettingValue("UI", "DisplayWindowGeometry");
+  if (old_geometry_b64 != geometry_b64.constData())
+    m_host_interface->SetStringSettingValue("UI", "DisplayWindowGeometry", geometry_b64.constData());
+}
+
+void MainWindow::restoreDisplayWindowGeometryFromConfig()
+{
+  const std::string geometry_b64 = m_host_interface->GetStringSettingValue("UI", "DisplayWindowGeometry");
+  const QByteArray geometry = QByteArray::fromBase64(QByteArray::fromStdString(geometry_b64));
+  if (!geometry.isEmpty())
+    m_display_widget->restoreGeometry(geometry);
+}
+
 SettingsDialog* MainWindow::getSettingsDialog()
 {
   if (!m_settings_dialog)

src/duckstation-qt/mainwindow.h

@@ -98,6 +98,8 @@ private:
   void switchToEmulationView();
   void saveStateToConfig();
   void restoreStateFromConfig();
+  void saveDisplayWindowGeometryToConfig();
+  void restoreDisplayWindowGeometryFromConfig();
   void destroyDisplayWidget();
   SettingsDialog* getSettingsDialog();
   void doSettings(SettingsDialog::Category category = SettingsDialog::Category::Count);