don't access sel in restack without checking for NULL (multihead crashing bug)
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							@@ -207,6 +207,7 @@ restack()
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	fi = 0;
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						fi = 0;
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	mi = 2 * f;
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						mi = 2 * f;
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						if(sel) {
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		if(sel->isfloat || arrange == dofloat) {
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							if(sel->isfloat || arrange == dofloat) {
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			wins[fi++] = sel->twin;
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								wins[fi++] = sel->twin;
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			wins[fi++] = sel->win;
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								wins[fi++] = sel->win;
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@@ -215,6 +216,7 @@ restack()
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			wins[mi++] = sel->twin;
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								wins[mi++] = sel->twin;
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			wins[mi++] = sel->win;
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								wins[mi++] = sel->win;
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		}
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							}
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						}
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	for(c = clients; c; c = c->next)
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						for(c = clients; c; c = c->next)
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		if(isvisible(c) && c != sel) {
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							if(isvisible(c) && c != sel) {
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			if(c->isfloat || arrange == dofloat) {
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								if(c->isfloat || arrange == dofloat) {
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