Don't use gtk.get_current_event_time() as the timestamp for window.activate()

gtk.get_current_event_time() will return 0 if there's no "current
event" (which will happen if this is invoked from a SugarKeyGrabber
callback, because that intercepts events below the gtk level). And
libwnck will g_warn if we pass "0" to window.activate(). Since
matchbox doesn't look at the timestamp anyway, it's simplest to just
always pass "1" there.

(Needed for part of #2159)

shell/view/ActivityHost.py

@@ -65,10 +65,15 @@ class ActivityHost:
         pass
 
     def present(self):
-        self._window.activate(gtk.get_current_event_time())
+        # wnck.Window.activate() expects a timestamp, but we don't
+        # always have one, and libwnck will complain if we pass "0",
+        # and matchbox doesn't look at the timestamp anyway. So we
+        # just always pass "1".
+        self._window.activate(1)
 
     def close(self):
-        self._window.close(gtk.get_current_event_time())
+        # The "1" is a fake timestamp as with present()
+        self._window.close(1)
 
     def show_dialog(self, dialog):
         dialog.show()