public void effectuer() {
if(!isTrivial())
{
Selection selectionFutur = getSelectionFutur();
getHistoire().executer(
new PartitionActionSelectionRemplacer(selection, selectionFutur ));
partitionPanel.calculer(Moment.min(getSelection().getMomentDebut(),
selectionFutur.getMomentDebut()));
partitionPanel.setSelection(selectionFutur);
}