Hack around ARGB task tray icon background display glitch

(cherry picked from commit 667839ee65)

kicker/applets/systemtray/systemtrayapplet.cpp

@@ -1130,13 +1130,20 @@ void SystemTrayApplet::setBackground()
 
 
 TrayEmbed::TrayEmbed( bool kdeTray, TQWidget* parent )
-    : QXEmbed( parent ), kde_tray( kdeTray )
+    : QXEmbed( parent ), kde_tray( kdeTray ), m_ensureBackgroundSetTimerCount(0)
 {
+    m_ensureBackgroundSetTimer = new TQTimer();
+    connect(m_ensureBackgroundSetTimer, TQT_SIGNAL(timeout()), this, TQT_SLOT(ensureBackgroundSet()));
     hide();
     m_scaledWidget = new TQWidget(parent);
     m_scaledWidget->hide();
 }
 
+TrayEmbed::~TrayEmbed()
+{
+    delete m_ensureBackgroundSetTimer;
+}
+
 void TrayEmbed::getIconSize(int defaultIconSize)
 {
     TQSize minSize = minimumSizeHint();
@@ -1170,6 +1177,7 @@ void TrayEmbed::setBackground()
     if (!isHidden())
     {
         XClearArea(x11Display(), embeddedWinId(), 0, 0, 0, 0, True);
+        m_ensureBackgroundSetTimerCount = 0;
         ensureBackgroundSet();
     }
 }
@@ -1212,5 +1220,16 @@ void TrayEmbed::ensureBackgroundSet()
 		XSetWindowBackgroundPixmap(x11Display(), embeddedWinId(), argbpixmap);
 		XFreePixmap(x11Display(), argbpixmap);
 		XFreeGC(x11Display(), gc);
+
+		// Repaint
+		XClearArea(x11Display(), embeddedWinId(), 0, 0, 0, 0, True);
+
+		// HACK
+		// Clear background artifacts in first available timeslot after initial icon display
+		if (m_ensureBackgroundSetTimerCount < 1) {
+			m_ensureBackgroundSetTimerCount++;
+			m_ensureBackgroundSetTimer->stop();
+			m_ensureBackgroundSetTimer->start(0, TRUE);
+		}
 	}
 }

kicker/applets/systemtray/systemtrayapplet.h

@@ -128,12 +128,15 @@ class TrayEmbed : public QXEmbed
     Q_OBJECT
 public:
     TrayEmbed( bool kdeTray, TQWidget* parent = NULL );
+    ~TrayEmbed();
     bool kdeTray() const { return kde_tray; }
     void setBackground();
     void getIconSize(int defaultIconSize);
 private:
     bool kde_tray;
     TQWidget *m_scaledWidget;
+    TQTimer* m_ensureBackgroundSetTimer;
+    int m_ensureBackgroundSetTimerCount;
 private slots:
     void ensureBackgroundSet();
 };