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diff --git a/nx-X11/lib/Xmu/ClientWin.c b/nx-X11/lib/Xmu/ClientWin.c
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+/* $Xorg: ClientWin.c,v 1.4 2001/02/09 02:03:51 xorgcvs Exp $ */
+
+/*
+
+Copyright 1989, 1998 The Open Group
+
+Permission to use, copy, modify, distribute, and sell this software and its
+documentation for any purpose is hereby granted without fee, provided that
+the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation.
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
+AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+Except as contained in this notice, the name of The Open Group shall not be
+used in advertising or otherwise to promote the sale, use or other dealings
+in this Software without prior written authorization from The Open Group.
+
+*/
+/* $XFree86: xc/lib/Xmu/ClientWin.c,v 1.7 2001/12/14 19:55:34 dawes Exp $ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+#include <X11/Xlib.h>
+#include <X11/Xatom.h>
+
+#include <X11/Xmu/WinUtil.h>
+
+/*
+ * Prototypes
+ */
+static Window TryChildren(Display*, Window, Atom);
+
+/* Find a window with WM_STATE, else return win itself, as per ICCCM */
+
+Window
+XmuClientWindow(Display *dpy, Window win)
+{
+ Atom WM_STATE;
+ Atom type = None;
+ int format;
+ unsigned long nitems, after;
+ unsigned char *data = NULL;
+ Window inf;
+
+ WM_STATE = XInternAtom(dpy, "WM_STATE", True);
+ if (!WM_STATE)
+ return win;
+ XGetWindowProperty(dpy, win, WM_STATE, 0, 0, False, AnyPropertyType,
+ &type, &format, &nitems, &after, &data);
+ if (data)
+ XFree(data);
+ if (type)
+ return win;
+ inf = TryChildren(dpy, win, WM_STATE);
+ if (!inf)
+ inf = win;
+ return inf;
+}
+
+static Window
+TryChildren(Display *dpy, Window win, Atom WM_STATE)
+{
+ Window root, parent;
+ Window *children;
+ unsigned int nchildren;
+ unsigned int i;
+ Atom type = None;
+ int format;
+ unsigned long nitems, after;
+ unsigned char *data;
+ Window inf = 0;
+
+ if (!XQueryTree(dpy, win, &root, &parent, &children, &nchildren))
+ return 0;
+ for (i = 0; !inf && (i < nchildren); i++) {
+ data = NULL;
+ XGetWindowProperty(dpy, children[i], WM_STATE, 0, 0, False,
+ AnyPropertyType, &type, &format, &nitems,
+ &after, &data);
+ if (data)
+ XFree(data);
+ if (type)
+ inf = children[i];
+ }
+ for (i = 0; !inf && (i < nchildren); i++)
+ inf = TryChildren(dpy, children[i], WM_STATE);
+ if (children)
+ XFree(children);
+ return inf;
+}