Qt: Force redraw the display when restoring after minimized

src/duckstation-qt/qtdisplaywidget.cpp

@@ -7,6 +7,7 @@
 #include <QtGui/QKeyEvent>
 #include <QtGui/QScreen>
 #include <QtGui/QWindow>
+#include <QtGui/QWindowStateChangeEvent>
 #include <cmath>
 
 QtDisplayWidget::QtDisplayWidget(QtHostInterface* host_interface, QWidget* parent)
@@ -144,6 +145,16 @@ bool QtDisplayWidget::event(QEvent* event)
       return true;
     }
 
+    case QEvent::WindowStateChange:
+    {
+      QWidget::event(event);
+
+      if (static_cast<QWindowStateChangeEvent*>(event)->oldState() & Qt::WindowMinimized)
+        emit windowRestoredEvent();
+
+      return true;
+    }
+
     default:
       return QWidget::event(event);
   }