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	Sync OpenBSD patchset 760:
When resizing the copy mode screen, don't allow it to end up with the viewable position beyond the size of the history.
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		@@ -1,4 +1,4 @@
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/* $Id: window-copy.c,v 1.123 2010-09-10 13:34:12 tcunha Exp $ */
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/* $Id: window-copy.c,v 1.124 2010-09-18 15:41:18 tcunha Exp $ */
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/*
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 * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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@@ -342,6 +342,8 @@ window_copy_resize(struct window_pane *wp, u_int sx, u_int sy)
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		data->cy = sy - 1;
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	if (data->cx > sx)
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		data->cx = sx;
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	if (data->oy > screen_hsize(data->backing))
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		data->oy = screen_hsize(data->backing);
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	window_copy_clear_selection(wp);
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