The concept of a block slug from a UX POV is great, but why do we need to keep them out of the DM? It seems to be the source of far too many getOffset hacks, as you can put your cursor somewhere that doesn't have a real offset (model-view inconsistency). We already have a way of marking a paragraph as to-be-ignored-by-the-converter-if-empty ({internal:'empty'}), so let's just put them in the DM, and throw them away at convert time if they're empty.
Version: unspecified
Severity: enhancement