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

*** 1224,1234 ****
          // 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));
              }
          }
          super.handleWindowFocusOut(oppositeWindow, serial);
      }
  }
--- 1224,1234 ----
          // 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(AWTAccessor.getComponentAccessor().getPeer(actualFocusedWindow));
              }
          }
          super.handleWindowFocusOut(oppositeWindow, serial);
      }
  }