Keep window role as lowercase, just like wmclass, for rules matching.

svn path=/trunk/kdebase/kwin/; revision=324251

client.cpp

@@ -1388,7 +1388,7 @@ static int nullErrorHandler(Display *, XErrorEvent *)
  */
 QCString Client::staticWindowRole(WId w)
     {
-    return getStringProperty(w, qt_window_role);
+    return getStringProperty(w, qt_window_role).lower();
     }
 
 /*!

events.cpp

@@ -853,7 +853,7 @@ void Client::propertyNotifyEvent( XPropertyEvent* e )
             else if (e->atom == atoms->wm_client_leader )
                 getWmClientLeader();
             else if( e->atom == qt_window_role )
-                window_role = getStringProperty( window(), qt_window_role );
+                window_role = staticWindowRole( window());
             break;
         }
     }

manage.cpp

@@ -25,7 +25,6 @@ License. See the file "COPYING" for the exact licensing terms.
 #include "rules.h"
 
 extern Time qt_x_time;
-extern Atom qt_window_role;
 
 namespace KWinInternal
 {
@@ -106,7 +105,7 @@ bool Client::manage( Window w, bool isMapped )
         }
     ignore_focus_stealing = options->checkIgnoreFocusStealing( this ); // TODO change to rules
 
-    window_role = getStringProperty( w, qt_window_role );
+    window_role = staticWindowRole( w );
     // first only read the caption text, so that setupWindowRules() can use it for matching,
     // and only then really set the caption using setCaption(), which checks for duplicates etc.
     // and also relies on rules already existing