Fix Kate not coming to foreground with focus in MDI mode

This resolves Bug 692
(cherry picked from commit 93993ebd03)

kdeui/kmainwindowiface.cpp

@@ -27,29 +27,7 @@
 #include <kaction.h>
 #include <tqclipboard.h>
 
-#include <X11/Xlib.h>
-#include <X11/Xatom.h>
-
-// INTERNAL
-// Originally from http://permalink.gmane.org/gmane.comp.lib.qt.general/4733
-void wmMessage(KMainWindow * mainWindow, long type, long l0, long l1, long l2, long l3, long l4)
-{
-	XClientMessageEvent xev;
-	
-	xev.type = ClientMessage;
-	xev.window = mainWindow->winId();
-	xev.message_type = type;
-	xev.format = 32;
-	xev.data.l[0] = l0;
-	xev.data.l[1] = l1;
-	xev.data.l[2] = l2;
-	xev.data.l[3] = l3;
-	xev.data.l[4] = l4;
-
-	XSendEvent(mainWindow->x11Display(), mainWindow->winId(), False,
-		(SubstructureNotifyMask | SubstructureRedirectMask),
-		(XEvent *)&xev);
-}
+#include <kwin.h>
 
 KMainWindowInterface::KMainWindowInterface(KMainWindow * mainWindow)
 	: DCOPObject( mainWindow->name()) 
@@ -216,8 +194,7 @@ void KMainWindowInterface::setActiveWindowFocused()
 	m_MainWindow->setActiveWindow();
 
 	// activate window (try to work around focus-stealing prevention)
-	static Atom NET_ACTIVE_WINDOW = XInternAtom(m_MainWindow->x11Display(), "_NET_ACTIVE_WINDOW", False);
-	wmMessage(m_MainWindow, NET_ACTIVE_WINDOW, 2, CurrentTime, 0, 0, 0);
+	KWin::forceActiveWindow(m_MainWindow->winId());
 }
 QCStringList KMainWindowInterface::functionsDynamic()
 {