We were deleting / recreating the graphics background item for *every*
mouse movement. Now we are just creating the painter path; no more
allocations / desalocations, adding, removing from the scene. This should
make things a tiny bit faster.
Signed-off-by: Tomaz Canabrava <tomaz.canabrava@intel.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
