Problem/Motivation
Drupal 6 text area text processing settings are not respected when migrating D6 fields to D8. Steps to reproduce:
D6 Field type: text
D6 Widget type: Text area (multiple rows)
D6 Global field settings / Text processing Plain text
Expected D8 field storage type: Text (plain, long)
Actual D8 field storage type: Text (formatted, long)
Proposed resolution
Fix getFieldType() of class \Drupal\text\Plugin\migrate\cckfield\TextField so that the text processing settings are respected.
Remaining tasks
I'll create a patch that fixes this and update the unit tests.
User interface changes
None.
API changes
None.
Data model changes
None.