fix: the window point not follow touch point on touch screen and enable hi-DPI

Change-Id: I215768f56879aba184e078882bddd0dea2396f97

Author: zccrs

src/common/mainwindow.cpp

@@ -2503,7 +2503,7 @@ void MainWindow::delayedMouseReleaseHandler()
 void MainWindow::mouseMoveEvent(QMouseEvent *ev)
 {
     if (_mouseMoved) {
-        return Utility::updateMousePointForWindowMove(this->winId(), ev->globalPos() * devicePixelRatio());
+        return Utility::updateMousePointForWindowMove(this->winId(), ev->globalPos() * devicePixelRatioF());
     }
 
     _mouseMoved = true;