Is there any option to restrict the format (HTML codes) that is saved within the visual editor in ACF?
I already restricted the Toolbar to a very limited set of formatting options. However, any kind of annoying formats can be accidentally introduced by copy-pasting formatted text from some where else.
The original TinyMCE has the option extended_valid_elements, that can define valid HTML markup.
Is it possible to define such an option in AFC as well?
After sleeping some nights over this issue, I looked again at the acf JS code and suddenly found the wysiwyg_tinymce_settings filter. This helped me to modify the input fo the tinymce.init() call. My solution is: