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	Sync OpenBSD patchset 746:
Treat trying to link or move to the same window as an error to avoid removing it accidentally.
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		@@ -1,4 +1,4 @@
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/* $Id: server-fn.c,v 1.109 2010-08-09 21:44:25 tcunha Exp $ */
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/* $Id: server-fn.c,v 1.110 2010-08-11 22:16:43 tcunha Exp $ */
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/*
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 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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@@ -281,7 +281,7 @@ server_link_window(struct session *src, struct winlink *srcwl,
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		dstwl = winlink_find_by_index(&dst->windows, dstidx);
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	if (dstwl != NULL) {
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		if (dstwl->window == srcwl->window)
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			return (0);
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			return (-1);
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		if (killflag) {
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			/*
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			 * Can't use session_detach as it will destroy session
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