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This allows custom movement generators to set ad-hoc properties on generated movements depending on properties of the corresponding input movement.

There was already _getUpdatePropertyDict which is similar, but was sometimes not enough because it can only be use to set extra properties on all movements.

As a result, when we needed a rule with custom properties on generated movements, we resorted to overriding getGeneratedMovementList and duplicating the full logic of the method. Existing cases have been updated to use the new _updateGeneratedMovementList and in the case of InventoryAssetPriceAccountingRuleMovementGenerator we no longer need to duplicate the logic.

Also remove the comment suggesting overriding getGeneratedMovementList in subclasses, now several "extension" methods exists, so it should not be needed to override getGeneratedMovementList, every needs should be coverred by defining _updateGeneratedMovementList or _getUpdatePropertyDict