Expose target type, selection handler and selection settings in LinkWidget

The Needs Review Queue Bot → tested this issue. It either no longer applies to Drupal core, or fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

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I tried to reroll the #49 patch for 9.5.9 but the field settings form was not working correctly: settings were not saved and AJAX requests did nothing.
I reworked the patch and now everything seems to work on my setup.
Unfortunately, I had to duplicate some methods from EntityReferenceItem.

(I tried to generate an interdiff but it fails for some reason.)

#53 was causing errors with existing fields, it should be better now.

The Needs Review Queue Bot → tested this issue. It fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

This does not mean that the patch needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

Consult the Drupal Contributor Guide → to find step-by-step guides for working with issues.

Tried to fix failures in #54.

Just noticed it triggers an exception in the widget when the target_type setting is empty.
I updated the patch to fix that.

The Needs Review Queue Bot → tested this issue. It fails the Drupal core commit checks. Therefore, this issue status is now "Needs work".

This does not mean that the patch needs to be re-rolled or the MR rebased. Read the Issue Summary, the issue tags and the latest discussion here to determine what needs to be done.

Consult the Drupal Contributor Guide → to find step-by-step guides for working with issues.

LinkWidget tries to call getFieldSetting statically and it can't work.

Fixed a notice when handler_settings is NULL.

Was previously tagged for tests which I believe are still needed.

And with the schema change an upgrade path may be needed.

But also there seemed to be some failures.

#60 was using the new node handler by default instead of keeping the old behavior.
The new handler should be opt-in.

Reroll for Drupal 10.2.5.

gaëlg → made their first commit to this issue’s fork.