In progress (with the removal of libnr in r10589): current trunk does use the correct visual bbox.
See related discussion in <http://thread.gmane.org/gmane.comp.graphics.inkscape.devel/37154/focus=37165>
(hesitating to close as 'Fix Released' until the performance regressions due to new (more precise) bbox calculation are fully solved)
In progress (with the removal of libnr in r10589): current trunk does use the correct visual bbox.
See related discussion in thread. gmane.org/ gmane.comp. graphics. inkscape. devel/37154/ focus=37165>
<http://
(hesitating to close as 'Fix Released' until the performance regressions due to new (more precise) bbox calculation are fully solved)