Wallpaper renderer has now QThread::LowPriority priority on every platform except Linux.

This might fix this bug on other platforms: https://bugs.kde.org/show_bug.cgi?id=213708

svn path=/trunk/KDE/kdelibs/; revision=1101239

private/wallpaperrenderthread.cpp

@@ -35,6 +35,8 @@ WallpaperRenderThread::WallpaperRenderThread(QObject *parent)
 {
     m_abort = false;
     m_restart = false;
+    
+    setPriority(QThread::LowPriority);
 }
 
 WallpaperRenderThread::~WallpaperRenderThread()