Deprecate EmptyContextInterface, InputInterface::setAllowEmpty & allowEmpty

[Maks3w]

Deprecate magic logic for auto attach a NonEmpty validator with breakChainOnFailure = true

Instead append NonEmpty validator when desired.

$input = new Zend\InputFilter\Input();
$input->setContinueIfEmpty(true);
$input->setAllowEmpty(true);
$input->getValidatorChain()->attach(new Zend\Validator\NotEmpty(), /* break chain on failure */ true);

Close https://github.com/zendframework/zend-inputfilter/issues/12

[Maks3w]

Since ZF 2.4 there are lot of bugs and headaches about the Required VS AllowEmpty VS ContinueIfEmpty matrix

This simplify the problem by removing the last two and forcing the user to attach the NotEmpty validator when he/she wants that behavior.

[weierophinney]

Any delegation needs to happen in add new minor version; as such, it needs to be targeted at 2.6.0.

[Maks3w]

I propose to do this on next patch because I found this a thing to be done ASAP. Anyway the most important thing is if we all agree this should be removed

[weierophinney]

Any deprecations MUST happen at a new minor release. After we get the other issues ironed out, we can do a 2.6.0 release with these changes.

[Maks3w]

Rebased on top of develop

[Maks3w]

Anyway I think deprecations should be backport to the lowest version for early adoptions of workarounds.

As soon as the developer avoid deprecated features as soon he/she will upgrade to major versions with less effort.

[Maks3w]

I think we have two classes of deprecatations.

• New features which make obsolete old one. This should be deprecated in a new minor because includes a new feature.
• Removal of code without new feature. This could be deprecated at any moment because there is no new code related to it.

[Maks3w]

Ready for 2.4.8 LTS