commit ec8e405ca447ba5bc5a9f6a2a12e2fa90412a0d4
Author: Andreas Hartmetz <ahartmetz@gmail.com>
Date:   Tue Jul 2 18:35:35 2013 +0200

    Fix pixmap leak when the tray icon changes (e.g. when it's animated).
    
    This could easily leak 4KB/second of X pixmap memory.
    All the actual difference comes from the QPixmap::ExplicitlyShared
    argument, the rest is making some wonky-looking but working code look
    less wonky.
    
    BUG: 314919

diff --git a/plasma/generic/applets/systemtray/protocols/fdo/x11embedcontainer.cpp b/plasma/generic/applets/systemtray/protocols/fdo/x11embedcontainer.cpp
index 1826512..a5bc826 100644
--- a/plasma/generic/applets/systemtray/protocols/fdo/x11embedcontainer.cpp
+++ b/plasma/generic/applets/systemtray/protocols/fdo/x11embedcontainer.cpp
@@ -194,8 +194,7 @@ void X11EmbedContainer::paintEvent(QPaintEvent *event)
 
     // Taking a detour via a QPixmap is unfortunately the only way we can get
     // the window contents into Qt's backing store.
-    QPixmap pixmap(size());
-    pixmap = toX11Pixmap(pixmap);
+    QPixmap pixmap = toX11Pixmap(QPixmap(size()));
     pixmap.fill(Qt::transparent);
     XRenderComposite(x11Info().display(), PictOpSrc, d->picture, None, pixmap.x11PictureHandle(),
                      0, 0, 0, 0, 0, 0, width(), height());
@@ -232,16 +231,18 @@ void X11EmbedContainer::setBackgroundPixmap(QPixmap background)
 // NOTE: The alpha-channel is not preserved if it exists, but for X pixmaps it generally should not be needed anyway.
 QPixmap X11EmbedContainer::toX11Pixmap(const QPixmap& pix)
 {
-    if(pix.handle() != 0)   // X11 pixmap
+    if (pix.handle() != 0)   // X11 pixmap
         return pix;
+    QPixmap ret;
     Pixmap xpix = XCreatePixmap(pix.x11Info().display(), RootWindow(pix.x11Info().display(), pix.x11Info().screen()),
                                 pix.width(), pix.height(), QX11Info::appDepth());
-    QPixmap wrk = QPixmap::fromX11Pixmap(xpix);
-    QPainter paint(&wrk);
-    paint.drawPixmap(0, 0, pix);
-    paint.end();
-    QPixmap ret = wrk.copy();
-    wrk = QPixmap(); // reset, so that xpix can be freed (QPixmap does not own it)
+    {
+        QPixmap wrk = QPixmap::fromX11Pixmap(xpix, QPixmap::ExplicitlyShared);
+        QPainter paint(&wrk);
+        paint.drawPixmap(0, 0, pix);
+        paint.end();
+        ret = wrk.copy();
+    } // free resources so that xpix can be freed (QPixmap does not own it)
     XFreePixmap(pix.x11Info().display(), xpix);
     return ret;
 }