qt: try another way

src/qt/qt_mainwindow.cpp

@@ -507,15 +507,6 @@ MainWindow::MainWindow(QWidget *parent) :
 #endif
     if (!vnc_enabled) video_setblit(qt_blit);
 
-    if (start_in_fullscreen) {
-        connect(ui->stackedWidget, &RendererStack::blit, this, [this] () {
-            if (start_in_fullscreen) {
-                QTimer::singleShot(100, ui->actionFullscreen, &QAction::trigger);
-                start_in_fullscreen = 0;
-            }
-        });
-    }
-
 #ifdef MTR_ENABLED
     {
         ui->actionBegin_trace->setVisible(true);
@@ -711,6 +702,10 @@ void MainWindow::showEvent(QShowEvent *event) {
         QApplication::processEvents();
         this->adjustSize();
     }
+    if (start_in_fullscreen) {
+        start_in_fullscreen = 0;
+        QTimer::singleShot(0, ui->actionFullscreen, &QAction::trigger);
+    }
 }
 
 void MainWindow::on_actionKeyboard_requires_capture_triggered() {