Add composition manager detection and support to Trinity

This adds the methods required to make transparent widgets via alpha blending a reality
An additional widget class may be coming shortly


git-svn-id: svn://anonsvn.kde.org/home/kde/branches/trinity/kdebase@1246265 283d02a7-25f6-0310-bc7c-ecb5cbfe19da

startkde

@@ -475,6 +475,9 @@ dcopserver_shutdown
 
 echo '[startkde] Starting Trinity...'  1>&2
 
+# Detect any running Xorg composition managers
+$KDEDIR/bin/kdetcompmgr
+
 # Run KPersonalizer before the session if this is the first login.
 if test "$kpersonalizerrc_general_firstlogin" = "true"; then
   if [ ! -x $KDEDIR/bin/kpersonalizer ]; then