JBR-2973 Copy/Move dialog not in the focus on drag-n-drop to Project Tool window from external application

(cherry picked from commit 20fe78b650)

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

@@ -708,6 +708,7 @@ class XDnDDropTargetProtocol extends XDropTargetProtocol {
         }
 
         if (targetXWindow != null) {
+            targetXWindow.setUserTime(xclient.get_data(2), true);
             notifyProtocolListener(targetXWindow, sourceX, sourceY, userAction,
                                    xclient, MouseEvent.MOUSE_RELEASED);
         }