Use 'renderPlain' or 'renderInIsolation' to render chapter headings on save
Merged
requested to merge issue/epub_reader_framework-3484910:3484910-use-renderinisolation-in into 2.x
Use the 'renderPlain' or 'renderInIsolation' function, dependent on Drupal version, to render chapter headings on save.
[3484910-use-renderinisolation-in]
Closes #3484910