[DX] [D8] Add a `validate()` method to entity classes

In Drupal 8, classes that are used in order to implement a content entity (which extend the ContentEntityBase class) have a validate() method that validates the values entered when creating the entity.

A similar method should be introduced in Backdrop and added to EntityInterface.

GitHub Link:

https://github.com/backdrop/backdrop-issues/issues/6061

GitHub Issue #:

6061

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Sorry, it did seem confusing when I read it back... So if I add some html to a text field, for example in a page or a block, whatever the text format of the field may be (raw html or basic...

Posted 10 hours 26 min ago by (beckdalecreative) on:

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Could you please post clear, step by step instructions to reproduce the problem? Your first message refers to HTML content, and your second to text formats. Please add details to reproduce each...

Posted 14 hours 11 min ago by Alejandro Cremaschi (argiepiano) on:

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Posted 15 hours 19 min ago by (beckdalecreative) on:

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