阴影不受窗体透明度影响，增加重叠实现描边效果

src/UserInterface/mainwindow.cpp

@@ -685,15 +685,19 @@ void MainWindow::paintEvent(QPaintEvent *event)
     painter.setPen(Qt::transparent);
     painter.setOpacity(transparency);
     painter.drawPath(path);
+    painter.restore();
     KWindowEffects::enableBlurBehind(this->winId(), true, QRegion(path.toFillPolygon().toPolygon()));
     QColor color = Qt::black;
-    for (int i = 0; i < 6; i++) {
+    painter.save();
+    for (int i = 0; i < 7; i++) {
         rect = this->rect().adjusted(i,  i, - i, - i);
         color.setAlpha(i * 6);
         painter.setBrush(Qt::NoBrush);
         painter.setPen(QPen(color, 1));
         painter.drawRoundedRect(rect, 10, 10);
     }
+    painter.restore();
+    QMainWindow::paintEvent(event);
 }
 /**
  * 鼠标点击窗口外部事件