More check for remvoing scene and scene group. - Without this check, it can make Inkscape crashed if we remove a node that had been removed. - Check whether it owns a parent node before removing. - A removed node has no parent node.

// -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
// vim: sw=4:ts=8:sts=4
#ifndef __X_SUPP_H_
#define __X_SUPP_H_

#include <X11/Xlib.h>

typedef Window MB_WINDOW;
typedef Display *MB_DISPLAY;

#endif