overwriting error controller should be updated for 4.4

[SimonHeimberg]

The article about customizing error pages [1] still mentions ExceptionController as base for a new error controller. But this class is depreacated in 4.4 (and removed in 5). But changing the class to
Symfony\\Component\\HttpKernel\\Controller\\ErrorController is not sufficient. The instructions for passing the debug flag do not match as well.

But do we advised to extend ErrorController, or maybe to set a custom service as error_renderer? But I do not get at all how selecting error_render works.

related: #12273

[1] https://symfony.com/doc/4.4/controller/error_pages.html#overriding-the-default-errorcontroller

[yceruto]

Hi @SimonHeimberg, you're right and we must remove the ExceptionController everywhere in this page and use ErrorController instead.

Let me know what you want to override exactly, so I can help you. It's likely that you don't need to override the ErrorController anymore, unless you want a different error system.

[SimonHeimberg]

@yceruto I do not need to change yet, I yust saw this while updateing to symfony 4

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also related: #13071