Auto-fill machine name using Name as 'source'

Still unsolved but totally makes sense. Let's use the code from other entity types that already solve this.

I think it might now be enough to use this form element type: https://api.drupal.org/api/drupal/core%21lib%21Drupal%21Core%21Render%21...

Has already been partially fixed in 🐛 Token (& token type) machine name requirements RTBC

Let's see if this works.

The machine name field already works on TokenCustomTypeForm.php, but not on TokenCustomForm.php. @anybody suggested to me that he will take another look at this. For now, back to “Needs work”.

I'll have a look at it asap, but unsure when that will be, so this is open to anyone for now...

The changes indeed don't seem to work. Maybe it's just not possible easily. Perhaps @grevil can have a short look, if he sees the reason, otherwise let's just leave this open for someone to resolve, who knows better...

I wouldn't spend too much time on this, it is very uncommon for a ContentEntityType to have a machine name. Usually content entities don't have "machine_names", instead they use a simple id as their method of identification.

Meaning there won't be many examples in core.

EDIT: Fixed it.
The problem was pretty good described by the exception thrown, when the commented out part is commented in:

LogicException: The machine name element "machine_name][widget][0][value" is defined before the source element "name",

We are trying to use the source of a field, which at that point in time doesn't exist. But it works now! Please review!

@grevil you're the best! :)

Automatically closed - issue fixed for 2 weeks with no activity.