Editable should get attributes of the element which is replaced

[Reinmar]

This came in https://github.com/ckeditor/ckeditor5-engine/issues/543. I added dir=rtl to the element the editor was replacing and I was expecting that the editable will have the same attribute.

OTOH, not all attributes can be copied. Styles, ids, etc, perhaps should be copied.

[fredck]

I'm wondering if we do anything like this in CKEditor 4.

[Reinmar]

I remember that we do something with dir, but I don't know what precisely. Either it's taken from the config or from the original element. But this made me think that config could be a better place... unless someone also wants to set couple of other attributes like e.g. content language (which can matter as well – e.g. for spellchecker).

[Reinmar]

The more I think about this... the more unsure I am how this should work. Inheriting classes may break the editor, id can't be inherited at all. There may be more such attributes. So, we should either:

• whitelist what makes sense to be inherited,
• allow passing these attrs in the config – this may be preferred (e.g. one may want to assign a specific class to the editable so the content inside is styled using some special styles).

PS. There's also #798.

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