diff --git a/sm.cpp b/sm.cpp
index 87d605d45b..715126752a 100644
--- a/sm.cpp
+++ b/sm.cpp
@@ -11,7 +11,6 @@ License. See the file "COPYING" for the exact licensing terms.
 
 #include "sm.h"
 
-//#include <kdebug.h>
 #include <unistd.h>
 #include <stdlib.h>
 #include <pwd.h>
@@ -23,6 +22,7 @@ License. See the file "COPYING" for the exact licensing terms.
 #include "client.h"
 #include <QSocketNotifier>
 #include <qsessionmanager.h>
+#include <kdebug.h>
 
 namespace KWinInternal
 {
@@ -257,6 +257,28 @@ bool Workspace::sessionInfoWindowTypeMatch( Client* c, SessionInfo* info )
     return info->windowType == c->windowType();
     }
 
+// maybe needed later
+#if 0
+// KMainWindow's without name() given have WM_WINDOW_ROLE in the form
+// of <appname>-mainwindow#<number>
+// when comparing them for fake session info, it's probably better to check
+// them without the trailing number
+bool Workspace::windowRoleMatch( const QByteArray& role1, const QByteArray& role2 )
+    {
+    if( role1.isEmpty() && role2.isEmpty())
+        return true;
+    int pos1 = role1.find( '#' );
+    int pos2 = role2.find( '#' );
+    bool ret;
+    if( pos1 < 0 || pos2 < 0 || pos1 != pos2 )
+        ret = role1 == role2;
+    else
+        ret = qstrncmp( role1, role2, pos1 ) == 0;
+    kDebug() << "WR:" << role1 << ":" << pos1 << ":" << role2 << ":" << pos2 << ":::" << ret << endl;
+    return ret;
+    }
+#endif
+
 static const char* const window_type_names[] = 
     {
     "Unknown", "Normal" , "Desktop", "Dock", "Toolbar", "Menu", "Dialog",