Comment 7 for bug 1395452

Earlier references from early 2004 which document current behavior as intentional:
<quote>
And lest I forget, the raise/lower commands need to be rewritten so that the
selection, too, cycles through only the objects that overlap it, not all the
objects of the document as now (this presently makes lower/raise almost
unusable in large documents).
</quote>
<http://article.gmane.org/gmane.comp.graphics.inkscape.devel/1301>

Related commit:
<http://sourceforge.net/p/inkscape/code/2338/>