Yes: there's for example text-clone-create which can be used for that (typically used for small chunks of text such as the tag names in XML's tag pairs), as well as the lentic package.
Thanks for answering! You mention it is for small texts, but what about entire paragraphs or even an entire outline? Would it still work?
– OrgmodesApr 20 '16 at 21:15
text-clone-create was not designed for large chunks of text. It might work, but buyer beware. lentic OTOH was designed to keep whole buffers in sync, so it should work fine even for large chunks of text.
– StefanApr 21 '16 at 15:16
text-clone-create
was not designed for large chunks of text. It might work, but buyer beware.lentic
OTOH was designed to keep whole buffers in sync, so it should work fine even for large chunks of text. – Stefan Apr 21 '16 at 15:16