Revert "Linux/X11/touch: don't send duplicate mouse-up events for first touch"

This reverts commit 8eab71fef4.

libs/tk/ydk/gdkwindow.c

@@ -10979,10 +10979,6 @@ proxy_button_event (GdkEvent *source_event,
 	  g_assert (0);
           return TRUE;
         }
-        if (type == GDK_TOUCH_END && NULL != _gdk_display_has_pointer_grab (display, serial)) {
-	  /* skip if grabbed, button release event will be sent directly */
-	  return TRUE;
-	}
         convert_toplevel_coords_to_window (event_win,
                                            toplevel_x, toplevel_y,
                                            &event->button.x, &event->button.y);