[O] initiate source edits and region

[Andreas Röhler]

Hi all,

want to wrap org-mode src markup around code in existing region.

Having a look at the way "<sTAB" works internally, it seems hard to make use of 
it.
The region is affected already by inserting "<sTAB".

That part probably would profit being moved closer to the way, edit commands 
are called commonly.

Maybe someone already wrote such region-sensitive insert/init?

Best regards,

Andreas