fix: The first attempt to switch from windowed mode to fullscreen mod…

…e failed.

To avoid the issue caused by the onActiveChanged event triggered during mode switching, we delay the timer.

log: as title
issue: linuxdeepin/developer-center#8137

launchercontroller.cpp

@@ -32,7 +32,8 @@ LauncherController::LauncherController(QObject *parent)
         m_currentFrame = QStringLiteral("FullscreenFrame");
     }
 
-    m_timer->setInterval(500);
+    // Interval set to 500=>700ms for issue https://github.com/linuxdeepin/developer-center/issues/8137
+    m_timer->setInterval(700);
     m_timer->setSingleShot(true);
 
     connect(DGuiApplicationHelper::instance(), &DGuiApplicationHelper::newProcessInstance,