src/java.desktop/unix/classes/sun/awt/X11/XDecoratedPeer.java

@@ -1224,11 +1224,11 @@
         // If the actual focused window is not this decorated window then retain it.
         if (actualFocusedWindow != null && actualFocusedWindow != target) {
             Window owner = XWindowPeer.getDecoratedOwner(actualFocusedWindow);
 
             if (owner != null && owner == target) {
-                setActualFocusedWindow((XWindowPeer) AWTAccessor.getComponentAccessor().getPeer(actualFocusedWindow));
+                setActualFocusedWindow(AWTAccessor.getComponentAccessor().getPeer(actualFocusedWindow));
             }
         }
         super.handleWindowFocusOut(oppositeWindow, serial);
     }
 }