calculateDependencies doesn't check $mode_entity if it is NULL

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Thank you for this patch but I think it is actually not necessary to throw an exception for this issue.

I think it is not relevant to fail in EntityDisplayBase::calculateDependencies() because it breaks the saving of a new display.

Here is an example:

function create_a_new_display_programatically() {
  $entity_type_id = 'block_content';
  $bundle_id = 'basic';
  $view_mode_id = 'teaser';
  $entity_display_repository = \Drupal::service('entity_display.repository');

  // This method tries to load the view mode and if not found, creates it but not saved yet.
  $display = $entity_display_repository->getViewDisplay($entity_type_id, $bundle_id, $view_mode_id);

  // Should be successful but actually throws the ConfigEntityDependencyException.
  // It became impossible to programmatically create a new entity display with this exception being thrown.
  return $display->save();
}

Not sure what the best approach is but we should find a way to allow saving of new display and calculating dependencies without throwing exception.

Sounds like two actions are needed:
1. add (a version of) the code in #44 as a test case, coupled with other rational variations if any.

2. update the patch to permit (1) to be run, i.e. creating display programmatically.

For (2) I suggest replacing the new 'throw' with setting a flag on the EntityDIsplayBase object signalling that dependencies are out of date, and then on save() if the flag is set then update the dependencies and _at that time_ throw the exception, as I would expect by then everything to exist.

If this doesn't work I'm somewhat stumped - the exception is thrown when the entity display for this display mode can't be loaded, so in what circumstances is it ok to have a display config referencing an unloadable mode config?

#43 sadly doesn't apply anymore on D10.1.2

Rerolled #43 against 11.x as MR.

@matthieuscarset @rivimey I think we should then proceed there instead of patches.

MR!6920 as patch file against 11.x (based on #43)

Anybody → closed merge request !6922

Anybody → changed the visibility of the branch 2741429-calculate-dependencies-doesnt-check-mode-entity-10.3.x to hidden.

Static patch from MR!6923 for Drupal 10.2.x attached!