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void
shiftview(const Arg *arg)
{
	Arg shifted;

	if (arg->i > 0) // left circular shift
		shifted.ui = (selmon->tagset[selmon->seltags] << arg->i)
		   | (selmon->tagset[selmon->seltags] >> (NUMTAGS - arg->i));

	else // right circular shift
		shifted.ui = selmon->tagset[selmon->seltags] >> (- arg->i)
		   | selmon->tagset[selmon->seltags] << (NUMTAGS + arg->i);

	view(&shifted);
}