sync: from linuxdeepin/dtkwidget

Synchronize source files from linuxdeepin/dtkwidget.

Source-pull-request: linuxdeepin/dtkwidget#708

Author: deepin-ci-robot

src/widgets/dalertcontrol.cpp

@@ -9,7 +9,6 @@
 #include <QTimer>
 #include <QLayout>
 #include <QEvent>
-#include <QGraphicsDropShadowEffect>
 
 DWIDGET_BEGIN_NAMESPACE
 
@@ -224,13 +223,6 @@ void DAlertControl::showAlertMessage(const QString &text, QWidget *follower, int
         d->frame->setBackgroundRole(QPalette::ToolTipBase);
         d->frame->setWidget(d->tooltip);
         d->frame->setBlurBackgroundEnabled(true);
-
-        auto effect = new QGraphicsDropShadowEffect(d->frame);
-        effect->setColor(QColor(0, 0, 0, 0.2 * 255));
-        effect->setBlurRadius(40);
-        effect->setXOffset(0);
-        effect->setYOffset(2);
-        d->frame->setGraphicsEffect(effect);
     }
 
     if (follower) {