6893325: JComboBox and dragging to an item outside the bounds of the...

6893325: JComboBox and dragging to an item outside the bounds of the containing JFrame is not selecting that

Reviewed-by: art, dcherepanov

jdk/src/solaris/classes/sun/awt/X11/XWindowPeer.java

@@ -2144,10 +2144,12 @@ class XWindowPeer extends XPanelPeer implements WindowPeer,
                         // Outside this toplevel hierarchy
                         // According to the specification of UngrabEvent, post it
                         // when press occurs outside of the window and not on its owned windows
+                        if (xbe.get_type() == XConstants.ButtonPress) {
                             grabLog.fine("Generating UngrabEvent on {0} because not inside of shell", this);
                             postEventToEventQueue(new sun.awt.UngrabEvent(getEventSource()));
                             return;
                         }
+                    }
                     // First, get the toplevel
                     XWindowPeer toplevel = target.getToplevelXWindow();
                     if (toplevel != null) {