Editing a block_content entity no longer redirects to the overview

To reproduce: on a raw install, add a second language; create a new block; save it (redirects to the blocks overview), then translate it and save -> stays n the same page and complains that the translation already exists.

After the MR: when saving after the translation, we are redirected to the blocks overview page.

Updating the IS with the steps to reproduce

Could we get a failing test as a next step.

but then that results in an exception as the translation already exists

Does anyone know if we have an existing issue about this behaviour? It feels like it would be better to display a message 'A translation already exists for the {language} language, you have been redirected to the edit form' and redirect

We should absolutely do that, that uncaught exception is horrible and easy to get to even without this bug (clicking on a already open and outdated translation overview page for example). Found 🐛 Do not fatal when trying to submit a content entity translation twice. Needs review .

Added tests, rebased, and fixed self-review.

Test coverage can be seen in the test-only job

1) Drupal\Tests\block_content\Functional\BlockContentCreationTest::testBlockContentFormSubmitHandlers
Behat\Mink\Exception\ExpectationException: Current page is "/admin/content/block/1", but "/admin/content/block" expected.
/builds/issue/drupal-3412283/core/tests/Drupal/Tests/WebAssert.php:580
/builds/issue/drupal-3412283/core/tests/Drupal/Tests/WebAssert.php:761
/builds/issue/drupal-3412283/core/modules/block_content/tests/src/Functional/BlockContentCreationTest.php:181

Verified following the steps in the issue summary and MR did solve the issue.

Committed/pushed to 11.x, cherry-picked to 10.3.x and 10.2.x, thanks!

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