Compositing always disabled by default for now.

svn path=/trunk/KDE/kdebase/workspace/; revision=756786

NOTES_4_0

@@ -26,6 +26,8 @@ This document is for creating the 4.0 release notes. There are 3 parts:
 Comments
 ========
 
+- mention how to turn it on
+- refer to COMPOSITE_HOWTO?
 
 
 Video

compositingprefs.cpp

@@ -44,6 +44,12 @@ CompositingPrefs::~CompositingPrefs()
     {
     }
 
+bool CompositingPrefs::enableCompositing() const
+    {
+    return false; // disabled by default, for the time being, until support becomes better
+    return mEnableCompositing;
+    }
+
 bool CompositingPrefs::compositingPossible()
     {
 #ifdef KWIN_HAVE_COMPOSITING

compositingprefs.h

@@ -52,7 +52,7 @@ public:
 
     static bool compositingPossible();
     static QString compositingNotPossibleReason();
-    bool enableCompositing() const  { return mEnableCompositing; }
+    bool enableCompositing() const;
     bool enableVSync() const  { return mEnableVSync; }
     bool enableDirectRendering() const  { return mEnableDirectRendering; }
     bool strictBinding() const { return mStrictBinding; }