public IEnumerable <IUnit> GetRedoableUnits(object ownerKey = null)
{
if (ownerKey == null)
{
return(new List <IUnit>(globallyRedoableUnits.Cast <IUnit>()));
}
if (!redoableDictionary.TryGetValue(ownerKey,
// ReSharper disable once CollectionNeverUpdated.Local
out UnitCollection <IUndoableUnit> units))
{
return(new List <IUnit>());
}
return(new List <IUnit>(units.Cast <IUnit>()));
}