1 files changed, 1 insertions, 42 deletions

diff --git a/src/widgets/util/qsystemtrayicon_x11.cpp b/src/widgets/util/qsystemtrayicon_x11.cpp
index df93e15f80..3f6166ae78 100644
--- a/src/widgets/util/qsystemtrayicon_x11.cpp
+++ b/src/widgets/util/qsystemtrayicon_x11.cpp
@@ -101,7 +101,6 @@ private:
     bool addToTray();
 
     QSystemTrayIcon *q;
-    QPixmap background;
 };
 
 QSystemTrayIconSys::QSystemTrayIconSys(QSystemTrayIcon *qIn)
@@ -117,29 +116,7 @@ QSystemTrayIconSys::QSystemTrayIconSys(QSystemTrayIcon *qIn)
     const QSize size(22, 22); // Gnome, standard size
     setGeometry(QRect(QPoint(0, 0), size));
     setMinimumSize(size);
-
-    // We need two different behaviors depending on whether the X11 visual for the system tray
-    // (a) exists and (b) supports an alpha channel, i.e. is 32 bits.
-    // If we have a visual that has an alpha channel, we can paint this widget with a transparent
-    // background and it will work.
-    // However, if there's no alpha channel visual, in order for transparent tray icons to work,
-    // we do not have a transparent background on the widget, but set the BackPixmap property of our
-    // window to ParentRelative (so that it inherits the background of its X11 parent window), call
-    // xcb_clear_region before painting (so that the inherited background is visible) and then grab
-    // the just-drawn background from the X11 server.
-    bool hasAlphaChannel = QXcbIntegrationFunctions::xEmbedSystemTrayVisualHasAlphaChannel();
-    setAttribute(Qt::WA_TranslucentBackground, hasAlphaChannel);
-    if (!hasAlphaChannel) {
-        createWinId();
-        QXcbWindowFunctions::setParentRelativeBackPixmap(windowHandle());
-
-        // XXX: This is actually required, but breaks things ("QWidget::paintEngine: Should no
-        // longer be called"). Why is this needed? When the widget is drawn, we use tricks to grab
-        // the tray icon's background from the server. If the tray icon isn't visible (because
-        // another window is on top of it), the trick fails and instead uses the content of that
-        // other window as the background.
-        // setAttribute(Qt::WA_PaintOnScreen);
-    }
+    setAttribute(Qt::WA_TranslucentBackground);
 
     addToTray();
 }
@@ -155,8 +132,6 @@ bool QSystemTrayIconSys::addToTray()
     if (!QXcbWindowFunctions::requestSystemTrayWindowDock(windowHandle()))
         return false;
 
-    if (!background.isNull())
-        background = QPixmap();
     show();
     return true;
 }
@@ -227,22 +202,6 @@ void QSystemTrayIconSys::paintEvent(QPaintEvent *)
     const QRect rect(QPoint(0, 0), geometry().size());
     QPainter painter(this);
 
-    // If we have Qt::WA_TranslucentBackground set, during widget creation
-    // we detected the systray visual supported an alpha channel
-    if (testAttribute(Qt::WA_TranslucentBackground)) {
-        painter.setCompositionMode(QPainter::CompositionMode_Source);
-        painter.fillRect(rect, Qt::transparent);
-    } else {
-        // clearRegion() was called on XEMBED_EMBEDDED_NOTIFY, so we hope that got done by now.
-        // Grab the tray background pixmap, before rendering the icon for the first time.
-        if (background.isNull()) {
-            background = QGuiApplication::primaryScreen()->grabWindow(winId(),
-                                0, 0, rect.size().width(), rect.size().height());
-        }
-        // Then paint over the icon area with the background before compositing the icon on top.
-        painter.drawPixmap(QPoint(0, 0), background);
-    }
-    painter.setCompositionMode(QPainter::CompositionMode_SourceOver);
     q->icon().paint(&painter, rect);
 }