Show the paragraph and field label of fields that fail validation

A little bit adjusted patch from #16.
Now it also tries to display the actual field name from nested paragraph.

Marked NR to initiate testing on #17.

The last submitted patch, 15: 3027525-14.patch, failed testing. View results →
- codesniffer_fixes.patch Interdiff of automated coding standards fixes only.

The last submitted patch, 17: 3027525_17.patch, failed testing. View results →
- codesniffer_fixes.patch Interdiff of automated coding standards fixes only.

#17 works fine here when a required field inside a collapsed paragraph have a null value

• Encountered an error when validation fails on a field without a label property. Fixed by using the getLabel() method.
• Update test to check for the improved error message contents.

Tested on Drupal 10.3.0-dev and Paragraphs 8.x-1.17

Paragraph label is displayed in the error message. Collapsing a required paragraph also triggers validation. We can confirm that the error message is triggered at both the node level and paragraph level.

RTBC

Converted to a MR, did manual testing, fixed a fatal error that could happen if the target type is no longer allowed by loading the paragraph type directly to get its label.

There's still room for improvement, specifically when you have multiple nested paragraphs, then the delta is not unique, but it's obviously a big improvement. Merged.

Just as a note for anyone looking into that change: By adding a sixth parameter to the widget class, this breaks functionality for modules extending Paragraphs, for example "Default Paragraphs".

That's unfortunate, missed that, I'd accept a patch to make it conditional with fallback in a new issue.

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