Since the tooltip text was used as key in the map, two events of the
same type, close to eachother, would cause one of them to not be
removed.
Since ToolTip::removeToolTip() isn't used, we don't need a QMap and can
use a QList instead, so all tooltips are properly cleared.
Signed-off-by: Michael Andreen <harv@ruin.nu>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
