I needed support for string_long field type for a project - the Facebook embed code/URL from media_entity_facebook (so posts can't be imported more than once).
This would also support formatted text fields.
Patch attached. It doesn't take into account the text format selected for a formatted text field (i.e. it compares 'value' like the other fields, not 'processed') but that is probably the most suitable approach anyway.
Fixed
1.0
Code
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Issue #3070688 by bgilhome: Formatted text (string_long) field support
Automatically closed - issue fixed for 2 weeks with no activity.