This patch prevents memory leak by adding the text on the list of
'delete me when model changes' items. it also makes things a bit more
snappy because the scene doesn't have to deal with all of the
texts bounding rectangles eveytime.
Signed-off-by: Tomaz Canabrava <tcanabrava@kde.org>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>