In
#2392319: Config objects (but not config entities) should by default be immutable →
we need to be able to use a trait in a form alter. This is so that form alter can save configuration once \Drupal::config() returns immutable config. For discussions on why this is preferable see that issue.
This change also has the advantage of making it easy to use new D8 best practices for form alters. For example, constructor injection and only autoloading the minimum amount of code to perform a request. Plus form alters are one of the entry points to drupal it would be great if they looked more like the rest of D8.
Postponed: needs info
11.0 🔥
forms system
Enhances developer experience.
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
I think this is now a duplicate of 📌 OOP hooks using event dispatcher Needs review but did not review the entire patch here to fully confirm that yet. Moving to needs more info instead, just in case we need to extract something out still.
Yeah since this was filed we also did the getEditable() stuff so I think this was resolved in a different way.