allow to split the first post too

[Hari-Bonda]

Feature Request

This feature will be a good addition to this extension only if split posts and add to an existing discussion enhancement is done
#44

allow splitting the first post too, if the discussion has no posts after splitting the first post soft delete it.

if this feature is possible we no longer need the merge extension too

[Hari-Bonda]

Someone built a move extension and that can do it. ✅