\Drupal calls should be avoided in classes, use dependency injection instead in src/Plugin/Field/FieldWidget/InlineEntityFormBase.php

A work in progress, but running it locally it isn't happen with $container->get('content_translation.manager').

I tried working on it with the following steps:

1. I navigated to inline_enetity_form Version Control
2. Used git command:
   

   git clone --branch '8.x-1.x' https://git.drupalcode.org/project/inline_entity_form.git
   cd inline_entity_form

3. Ran automated tests locally, which all passed before trying to work on it
4. Located the file according to the scope of the issue i.e InlineEntityFormBase.php. Saw the dependency Injection has been addressed

I will suggest a second eye before this issue is changed to fixed/RTBC/Works as designed

I just checked without the patch and the phpcs indeed points to whats demanded on the issue, in the file.
Applied the patch in comment #8 and its gone.

Thats for me a RTBC, since the scope is fixed.

I'm not sure why this got committed despite the failing tests?

Reverted the patch. If you wonder why it got committed, it's due to the RTBC. But yes I agree, I shouldn't have committed it with failing tests.

fwiw, test failures were addresses as part of #3307144: Tests are failing...

Using the patch on #2 and the patch on #3307144-2: Tests are failing, almost all the tests are running again.
TBH, I think the problem is bigger than this one test failing because is the test to check all the translations, and the DI is of 'content_translation.manager' but I cannot find any mistake on the DI.