So, we are all aware of this post, which essentially says that messages with multiple lines are considered to be "pasted" and therefore have no markdown processing run on them.
All well and good, until it's actually useful to have.
I'd respectfully like to revisit this topic now, almost six years after the creation of the original post. Times have changed, and a decent number of users have asked why this exists.
The old argument about it being code seems to fall on its back now, as there's a button to format it, well, as code when multiple lines are present:
This may have been by design back in 2010, but I really do think it's about time that this gets re-evaluated into the actual problem that it is.